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Intraseasonal Oscillation of Tropospheric Ozone over the Indian Summer Monsoon Region 预览
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作者 Yuli ZHANG Chuanxi LIU +1 位作者 Yi LIU Rui YANG 《大气科学进展:英文版》 SCIE CAS CSCD 2019年第4期417-430,共14页
Boreal summer intraseasonal oscillation(BSISO)of lower tropospheric ozone is observed in the Indian summer monsoon(ISM)region on the basis of ERA-Interim reanalysis data and ozonesonde data from the World Ozone and Ul... Boreal summer intraseasonal oscillation(BSISO)of lower tropospheric ozone is observed in the Indian summer monsoon(ISM)region on the basis of ERA-Interim reanalysis data and ozonesonde data from the World Ozone and Ultraviolet Radiation Data Centre.The 30–60-day intraseasonal variation of lower-tropospheric ozone shows a northwest–southeast pattern with northeastward propagation in the ISM region.The most significant ozone variations are observed in the Maritime Continent and western North Pacific.In the tropics,ozone anomalies extend from the surface to 300 hPa;however,in extratropical areas,it is mainly observed under 500 hPa.Precipitation caused by BSISO plays a dominant role in modulating the BSISO of lower-tropospheric ozone in the tropics,causing negative/positive ozone anomalies in phases 1–3/5–6.As the BSISO propagates northeastward to the western North Pacific,horizontal transport becomes relatively more important,increasing/reducing tropospheric ozone via anticyclonic/cyclonic anomalies over the western North Pacific in phases 3–4/7–8.As two extreme conditions of the ISM,most of its active/break events occur in BSISO phases 4–7/1–8 when suppressed /enhanced convection appears over the equatorial eastern Indian Ocean and enhanced/suppressed convection appears over India,the Bay of Bengal,and the South China Sea.As a result,the BSISO of tropospheric ozone shows significant positive /negative anomalies over the Maritime Continent,as well as negative/positive anomalies over India,the Bay of Bengal,and the South China Sea in active/break spells of the ISM.This BSISO of tropospheric ozone is more remarkable in break spells than in active spells of the ISM,due to the stronger amplitude of BSISO in the former. 展开更多
关键词 BOREAL SUMMER INTRASEASONAL oscillation TROPOSPHERIC OZONE Indian SUMMER MONSOON active/break spell
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Boreal Summer Intraseasonal Oscillation in the Asian–Pacific Monsoon Region Simulated in CAMS-CSM
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作者 Yanjun QI Renhe ZHANG +2 位作者 Xinyao RONG Jian LI Lun LI 《气象学报:英文版》 SCIE CSCD 2019年第1期66-79,共14页
The boreal summer intraseasonal oscillation(BSISO) is simulated by the Climate System Model(CSM) developed at the Chinese Academy of Meteorological Sciences(CAMS), China Meteorological Administration. Firstly, the res... The boreal summer intraseasonal oscillation(BSISO) is simulated by the Climate System Model(CSM) developed at the Chinese Academy of Meteorological Sciences(CAMS), China Meteorological Administration. Firstly, the results indicate that this new model is able to reasonably simulate the annual cycle and seasonal mean of the precipitation, as well as the vertical shear of large-scale zonal wind in the tropics. The model also reproduces the eastward and northward propagating oscillation signals similar to those found in observations. The simulation of BSISO is generally in agreement with the observations in terms of variance center, periodicity, and propagation, with the exception that the magnitude of BSISO anomalous convections are underestimated during both its eastward propagation along the equator and its northward propagation over the Asian–Pacific summer monsoon region. Our preliminary evaluation of the simulated BSISO by CAMS-CSM suggests that this new model has the capability, to a certain extent, to capture the BSISO features, including its propagation zonally along the equator and meridionally over the Asian monsoon region. 展开更多
关键词 CAMS-CSM boreal SUMMER intraseasonal oscillation(BSISO) Asian–Pacific SUMMER monsoon region
INTERDECADAL CHANGE OF DIABATIC FORCING OVER KEY REGION OF THE MARITIME CONTINENT AND ITS POSSIBLE RELATIONS WITH THE EAST ASIAN SUMMER MONSOON ANOMALIES
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作者 许琪 管兆勇 《热带气象学报:英文版》 SCIE 2019年第1期54-62,共9页
The Maritime Continent(MC) is an important region where the Tropical Pacific and the Indian Ocean interact with each other via 'the atmospheric bridge' and a key region for the interaction between the Asian an... The Maritime Continent(MC) is an important region where the Tropical Pacific and the Indian Ocean interact with each other via 'the atmospheric bridge' and a key region for the interaction between the Asian and Australian monsoons. Using the NCEP/NCAR and CMAP monthly mean reanalysis over the period of 1979-2012, the interdecadal variations of diabatic forcing over the key region of the Maritime Continent and its possible relations with the East Asian summer monsoon have been investigated in the present paper. Our results show that climate variations in the Maritime Continent is particularly significant in the area of 95-145°E, 10°S-10°N, which is thus defined as the key area of the MC(i.e., KMC area). Without the input of latent heat release in the atmosphere, distinct interdecadal change of diabatic heating is found to exist from 1979 to 2012;it intensified before 1980 s and peaked in the late 1980 s and weakened after this period. By analyzing each individual component that contributes to the diabatic heating in the KMC area, surface latent heat flux and net long-wave radiation in the atmosphere are found to be the two dominant components. With negative diabatic heating anomalies over KMC, there will be more precipitation on islands and less precipitation over sea, and more rainfall around the equator, which is in correspondence with the convergence center around the equator in the KMC area. Along the meridional-vertical section averaged between 115-120 ° E, the well-defined vertical circulation anomalies are observed with the ascending branches over KMC and the area around 30°N respectively, and the descending branch over the South China Sea. Water vapor transports from the Bay of Bengal and South China Sea to eastern China to benefit the positive precipitation anomalies. The meridional-vertical circulation in East Asia plays a critical role in linking the interdecadal variability of diabatic heating over the KMC and East Asian summer monsoon anomalies. 展开更多
关键词 maritime CONTINENT diabatic heating East Asian SUMMER monsoon INTERDECADAL variability BOREAL SUMMER
黑龙江省夏季雨日变化及前期环流特征
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作者 张健 《自然灾害学报》 CSCD 北大核心 2019年第4期220-226,共7页
利用1961-2017年黑龙江省62个台站的雨日资料,采用小波分析、相关系数与趋势系数等方法分析,研究夏季不同级别雨日的气候变化趋势.结果表明,黑龙江省夏季各级雨日变化趋势暴雨、大雨以上日数呈现略增加趋势,而中雨和小雨以上日数呈现略... 利用1961-2017年黑龙江省62个台站的雨日资料,采用小波分析、相关系数与趋势系数等方法分析,研究夏季不同级别雨日的气候变化趋势.结果表明,黑龙江省夏季各级雨日变化趋势暴雨、大雨以上日数呈现略增加趋势,而中雨和小雨以上日数呈现略减少的趋势;夏季降水日数平均分布,各级别以上的日数分布中心基本是一致的。用黑龙江省夏季大雨以上日数做代表进行分析,小波分析表明存在20a(年)左右的年代际变化周期,还有9a左右、6a左右和3a左右的年际变化周期;前期北半球500hPa(百帕)环流场特征,初冬季由极地到太平洋距平场“-+-”形式,夏季大雨以上日数易偏多,反之,排列为“+-+”形式,夏季大雨日数易偏少。 展开更多
关键词 夏季 雨日 分析 500hPa月平均环流场 前期特征
Diurnal Variations of Precipitation over North China Regulated by the Mountain-plains Solenoid and Boundary-layer Inertial Oscillation 预览
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作者 He PAN Guixing CHEN 《大气科学进展:英文版》 SCIE CAS CSCD 2019年第8期863-884,共22页
The mountain-plains solenoid(MPS) and boundary-layer inertial oscillation(BLO) are two typical regional forcings at the diurnal time scale. Their relative role in regulating the diurnal variations of summer rainfall o... The mountain-plains solenoid(MPS) and boundary-layer inertial oscillation(BLO) are two typical regional forcings at the diurnal time scale. Their relative role in regulating the diurnal variations of summer rainfall over North China and their change under different monsoon conditions are studied using a 19-yr archive of satellite rainfall and reanalysis data. It is shown that both a strong MPS and BLO can increase nocturnal rainfall in the North China plains but exhibit evident regional differences. The MPS-induced nocturnal rainfall is relatively confined to the plains adjacent to mountains from late night to morning, due to the upward branch of the nighttime MPS. In contrast, the BLO-induced nocturnal rainfall strengthens from early evening and is more extensive in early morning over the open plains further east. The contrasting effect in the evening is related to the convergent(divergent) easterly anomaly in the plains under the BLO(MPS). The BLO also induces the relatively strong enhancement of moisture convergence and high humidity by the southerly anomaly at late night. On strong monsoon days, the nocturnal rainfall amount associated with the MPS and BLO increases considerably in the plains.Both regional forcings become effective in regulating the rainfall diurnal cycle with enhanced moisture convergence under monsoon conditions. Their induced diurnal amplitudes of moisture convergence can be comparable to the daily mean by monsoon flow. The regional forcings thus couple with monsoon flow to strengthen rainfall in the plains, particularly from late night to morning. The results highlight that a combination of regional and large-scale forcings can strongly regulate the warm-season climate. 展开更多
关键词 DIURNAL cycle NOCTURNAL rainfall REGIONAL forcings summer MONSOON REGIONAL climate
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黑龙江省夏季低温指数变化特征分析 预览
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作者 田宝星 吴双 +3 位作者 杨帆 陈晶 赵放 宫丽娟 《黑龙江农业科学》 2019年第4期6-10,共5页
为了解近44年来黑龙江省夏季低温指数的分布规律和变化趋势。利用1971-2014年黑龙江省80个气象台站夏季日最低气温和平均气温观测资料,结合低温指数模型,通过趋势变化、小波分析和Mann-Kendall检测等方法,分析黑龙江省夏季低温指数的变... 为了解近44年来黑龙江省夏季低温指数的分布规律和变化趋势。利用1971-2014年黑龙江省80个气象台站夏季日最低气温和平均气温观测资料,结合低温指数模型,通过趋势变化、小波分析和Mann-Kendall检测等方法,分析黑龙江省夏季低温指数的变化特征。结果表明:黑龙江省夏季平均低温指数呈减少趋势,夏季低温指数在20世纪80、90年代和21世纪初变化不明显,而2010s以来明显减少,夏季平均低温指数较春季小。气温从1980s升温以来,低温指数明显减少,夏季低温指数自1970s中期以来明显减少,低温指数序列突变开始于1983年前后,夏季低温指数变化与气温呈负相关。夏季低温指数存在18~32a,6~14a和4~8a三个尺度的周期变化,其中18~32a尺度非常稳定且具全域性,在1980s中期以前6~14a尺度较为稳定,在1980s中期以后4~8a尺度较为稳定,7~12a尺度年周期变化最明显但有局域性(1980s中期以前),24~31a尺度能量虽弱且具有全域性。夏季低温指数有26、8、和5a的主周期,其中第一主周期为8a,平均周期为5.5a;第二主周期为26a,平均周期为14.5a。 展开更多
关键词 黑龙江省 夏季 小波分析 低温 突变检验
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Recent Progress in Studies of the Variabilities and Mechanisms of the East Asian Monsoon in a Changing Climate 预览
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作者 Wen CHEN Lin WANG +4 位作者 Juan FENG Zhiping WEN Tiaojiao MA Xiuqun YANG Chenghai WANG 《大气科学进展:英文版》 SCIE CAS CSCD 2019年第9期887-901,共15页
Located in a monsoon domain,East Asia suffers devastating natural hazards induced by anomalous monsoon behaviors.East Asian monsoon(EAM)research has traditionally been a high priority for the Chinese climate community... Located in a monsoon domain,East Asia suffers devastating natural hazards induced by anomalous monsoon behaviors.East Asian monsoon(EAM)research has traditionally been a high priority for the Chinese climate community and is particularly challenging in a changing climate where the global mean temperature has been rising.Recent advances in studies of the variabilities and mechanisms of the EAM are reviewed in this paper,focusing on the interannual to interdecadal time scales.Some new results have been achieved in understanding the behaviors of the EAM,such as the evolution of the East Asian summer monsoon(EASM),including both its onset and withdrawal over the South China Sea,the changes in the northern boundary activity of the EASM,or the transitional climate zone in East Asia,and the cycle of the EASM and the East Asian winter monsoon and their linkages.In addition,understanding of the mechanism of the EAM variability has improved in several aspects,including the impacts of different types of ENSO on the EAM,the impacts from the Indian Ocean and Atlantic Ocean,and the roles of mid-to high-latitude processes.Finally,some scientific issues regarding our understanding of the EAM are proposed for future investigation. 展开更多
关键词 EAST ASIAN summer MONSOON EAST ASIAN winter MONSOON CHANGING CLIMATE MONSOON onset and withdrawal transitional CLIMATE zone different types of ENSO
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温和地区地铁车厢夏季热环境现状调查研究
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作者 管宏宇 胡松涛 刘国丹 《暖通空调》 2019年第8期63-67,共5页
以昆明地铁1,2号线为研究对象,对地铁车厢夏季热环境参数进行了测试;同时通过主观问卷得到乘客的实际热感受评价情况。实地调研得到了昆明地铁车厢热环境现状,并计算了高峰期与非高峰期乘客热中性温度与可接受温度范围。从健康、舒适、... 以昆明地铁1,2号线为研究对象,对地铁车厢夏季热环境参数进行了测试;同时通过主观问卷得到乘客的实际热感受评价情况。实地调研得到了昆明地铁车厢热环境现状,并计算了高峰期与非高峰期乘客热中性温度与可接受温度范围。从健康、舒适、节能的角度出发,建议适当提高昆明地铁空调设定温度:高峰期间为25℃,非高峰期间为27℃。 展开更多
关键词 温和地区 地铁车厢 夏季 热环境 空调参数
Extremely Active Tropical Cyclone Activities over the Western North Pacific and South China Sea in Summer 2018:Joint Effects of Decaying La Nina and Intraseasonal Oscillation
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作者 Lijuan CHENU Zhensong GONG +1 位作者 Jie WU Weijing LI 《气象学报:英文版》 SCIE CSCD 2019年第4期609-626,共18页
In summer 2018,a total of 18 tropical cyclones(TCs)formed in the western North Pacific(WNP)and South China Sea(SCS),among which 8 TCs landed in China,ranking respectively the second and the first highest since 1951.Mo... In summer 2018,a total of 18 tropical cyclones(TCs)formed in the western North Pacific(WNP)and South China Sea(SCS),among which 8 TCs landed in China,ranking respectively the second and the first highest since 1951.Most of these TCs travelled northwest to northward,bringing in heavy rainfall and strong winds in eastern China and Japan.The present study investigates the impacts of decaying La Nina and intraseasonal oscillation(ISO)on the extremely active TCs over the WNP and SCS in summer 2018 by use of correlation and composite analyses.It is found that the La Nina episode from October 2017 to March 2018 led to above-normal sea surface temperature(SST)over central–western Pacific,lower sea level pressure and 500-hPa geopotential height over WNP,and abnormally strong convective activities over the western Pacific in summer 2018.These preceding oceanic thermal conditions and their effects on circulation anomalies are favorable to TC genesis in summer.Detailed examination reveals that the monsoon trough was located further north and east,inducing more TCs in northern and eastern WNP;and the more eastward WNP subtropical high as well as the significant wave train with a"-+-+"height anomaly pattern over the midlatitude Eurasia–North Pacific region facilitated the northwest to northward TC tracks.Further analyses reveal that two successively active periods of Madden–Julian Oscillation(MJO)occurred in summer 2018 and the boreal summer intraseasonal oscillation(BSISO)was also active over WNP,propagating northward significantly,corresponding to the more northward TC tracks.The MJO was stagnant over the Maritime Continent to western Pacific,leading to notably enhanced convection in the lower troposphere and divergence in the upper troposphere,conducive to TC occurrences.In a word,the extremely active TC activities over the WNP and SCS in summer 2018 are closely linked with the decaying La Nina,and the MJO and BSISO;their joint effects result in increased TC occurrences and the TC tracks being shifted more northwest t 展开更多
关键词 western North Pacific (WNP) tropical cyclone (TC) La Nina event Madden-Julian Oscillation (MJO) boreal summer intraseasonal oscillation (BSISO)
Predictability of Chinese Summer Extreme Rainfall Based on Arctic Sea Ice and Tropical Sea Surface Temperature 预览
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作者 ZHU Zhihui HUANG Fei XIE Xiao 《中国海洋大学学报:英文版》 SCIE CAS CSCD 2019年第3期626-632,共7页
Chinese summer extreme rainfall often brings huge economic losses, so the prediction of summer extreme rainfall is necessary. This study focuses on the predictability of the leading mode of Chinese summer extreme rain... Chinese summer extreme rainfall often brings huge economic losses, so the prediction of summer extreme rainfall is necessary. This study focuses on the predictability of the leading mode of Chinese summer extreme rainfall from empirical orthogonal function(EOF) analysis. The predictors used in this study are Arctic sea ice concentration(ASIC) and regional sea surface temperature(SST) in selected optimal time periods. The most important role that Arctic sea ice(ASI) plays in the appearance of EOF1 may be strengthening the high pressure over North China, thereby preventing water vapor from going north. The contribution of SST is mainly at low latitudes and characterized by a significant cyclone anomaly over South China. The forecast models using predictor ASIC(PA), SST(PS), and the two together(PAS) are established by using data from 1980 to 2004. An independent forecast is made for the last 11 years(2005-2015). The correlation coefficient(COR) skills between the observed and cross-validation reforecast principal components(PC) of the PA, PS, and PAS models are 0.47, 0.66, and 0.76, respectively. These values indicate that SST is a major cause of Chinese summer extreme rainfall during 1980-2004. The COR skill of the PA model during the independent forecast period of 2004-2015 is 0.7, which is significantly higher than those of the PS and PAS models. Thus, the main factor influencing Chinese summer extreme rainfall in recent years has changed from low latitudes to high latitudes. The impact of ASI on Chinese summer extreme rainfall is becoming increasingly significant. 展开更多
关键词 ASI SUMMER extreme RAINFALL prediction
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Buried channels provide keys to infer Quaternary stratigraphic and paleo-environmental changes:A case study from the west coast of India 预览
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作者 K.M. Dubey A.K.Chaubey +1 位作者 V.P. Mahale S.M. Karisiddaiah 《地学前缘:英文版》 CAS CSCD 2019年第4期1577-1595,共19页
High resolution shallow seismic data was acquired from inner continental shelf of Goa,west coast of India to map underlying stratigraphic and buried geomorphic features of shelf strata.Seismic data revealed characteri... High resolution shallow seismic data was acquired from inner continental shelf of Goa,west coast of India to map underlying stratigraphic and buried geomorphic features of shelf strata.Seismic data revealed characteristic channel incisions beneath 4-15 m thick sediment layer and corresponds to multi cycle incisions.Stratigraphic analysis of these incision signatures reveals three prominent subaerial unconformities S6,S7 and S9.These unconformities were exposed during the last glacial,penultimate glacial(MIS-6)and prior to penultimate glacial(MIS-8)periods.On the basis of interpreted age of subaerial unconformities and differences in their morphological features,observed channel incisions have been divided grossly into three phases of incision.Phase-1 incisions are older than~330 kyr BP,whereas,incisions of Phase-2 and Phase-3 correspond to~320-125 kyr BP and~115-10 kyr BP respectively.Plan form of these incisions varied from a straight channel type to ingrown meander and then to anastomosing channel types.These channels meet at the confluence of present-day Mandovi and Zuari rivers.The confluence point has varied in due course of time because of cyclic incision and burial with repeated sea level fluctuations.The preserved main channel width varies from~100 m to 1000 m.and maximum channel depth reaches up to~35 m.Comparison of quantitative and qualitative morphologic results of different phases of incisions suggest that Phase-2 channels had~33%more mean bank full discharge than that of the Phase-3 channels.Phase-2 incisions had been carved in higher hydraulic energy condition as compared to Phase-3 incisions implying that the Indian summer monsoon was better during formative stages of Phase-2 incisions. 展开更多
关键词 BURIED CHANNELS Glacial period Indian summer monsoon QUATERNARY SEA-LEVEL Subaerial UNCONFORMITY West coast of India
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北京城区夏冬两季VOCs时间变化和光化学特征的质子转移反应飞行时间质谱(PTR-TOF-MS)观测
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作者 盛久江 王飞 +5 位作者 李霞 马志强 刘全 赵德龙 黄梦宇 丁德平 《环境化学》 CAS CSCD 北大核心 2019年第7期1590-1599,共10页
为增进对北京地区不同季节大气挥发性有机物(VOCs)变化特征的认识,利用高时间分辨率质子迁移反应-飞行时间质谱(PTR-TOF-MS)于2016年在北京城区开展了VOCs(甲醛、乙醛、丙酮、异戊二烯、苯、甲苯和8碳芳香烃)夏季(6月8日—20日)和冬季(1... 为增进对北京地区不同季节大气挥发性有机物(VOCs)变化特征的认识,利用高时间分辨率质子迁移反应-飞行时间质谱(PTR-TOF-MS)于2016年在北京城区开展了VOCs(甲醛、乙醛、丙酮、异戊二烯、苯、甲苯和8碳芳香烃)夏季(6月8日—20日)和冬季(11月22日—12月10日)的连续观测.VOCs体积分数(浓度)的均值为(夏季/冬季,×10-9):甲醛(8.56/24.58)、乙醛(3.95/7.57)、丙酮(5.06/3.50)、异戊二烯(0.66/0.52)、苯(0.53/1.78)、甲苯(1.03/2.54)、8碳芳香烃(1.34/3.42).受大气扩散条件的影响,夏冬两季大部分VOCs浓度波动趋势相近,仅异戊二烯在夏季拥有明显的白天浓度高于夜间的时间序列,其白天的高浓度与植被排放较强有关.由日变化可见:冬季,所有VOCs在中午浓度处于全天较低水平,在早高峰期间VOCs浓度上升明显;夏季,甲醛、乙醛和丙酮等3种含氧VOCs(OVOCs)在中午有短暂的浓度峰值,这与它们光化学二次生成加快有关.由VOC与苯浓度比值的日变化可知:冬季与夏季类似,中午前后3种OVOCs(甲醛、乙醛和丙酮)的光化学生成以及甲苯和8碳芳香烃的光化学消耗都会增强,只是冬季增强的程度明显弱于夏季;在夏冬两季,甲醛中午的光化学生成速率均强于乙醛和丙酮.8碳芳香烃光化学消耗速率大于甲苯的速率仅出现在夏季;异戊二烯在冬季白天不存在植被排放增强的现象,但有光化学消耗加快的特征;夏季北京城区VOCs以机动车排放影响为主,而冬季VOCs还可能来自于燃煤排放. 展开更多
关键词 挥发性有机物 日变化 光化学 夏季 冬季 北京
MOISTURE TRANSPORT PATHS AND SOURCES OF SOUTH CHINA ANNUALLY FIRST RAINY SEASON AND THEIR RELATIONSHIP WITH THE ONSET OF THE SOUTH CHINA SEA SUMMER MONSOON
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作者 李晓帆 江志红 施逸 《热带气象学报:英文版》 SCIE 2019年第2期171-179,共9页
This study simulated the moisture transport process of southern China annually first rainy season(SCAFRS)using a Lagrangian airflow trajectory model(Hybrid Single Particle Lagrangian Integrated Trajectory: HYSPLIT), t... This study simulated the moisture transport process of southern China annually first rainy season(SCAFRS)using a Lagrangian airflow trajectory model(Hybrid Single Particle Lagrangian Integrated Trajectory: HYSPLIT), to determine SCAFRS moisture transport characteristics and their relationship with South China Sea summer monsoon(SCSSM). It is found that the moisture transport paths and sources of SCAFRS are closely related to the onset of SCSSM. Divided by SCSSM onset dates, the moisture transport characteristics of SCAFRS are compared quantitatively.Before the onset of SCSSM, precipitation of SCAFRS mainly comes from western Pacific and eastern China. Their contributions are 24% and 25%, respectively. The amount of water vapor carried along the path coming from Bay of Bengal-South China Sea(BSC) is relatively high, but the contribution rate of this path to SCAFRS precipitation is relatively low. Mainly due to strong precipitation over Bay of Bengal before the onset of SCSSM, this region is a moisture sink, which makes most moisture deposit in this region and only a small portion of water vapor transported to southern China. After the onset of SCSSM, most water vapor is transported to southern China by the southwesterly paths. The Indian Ocean is the main moisture source, which contributes almost 25% to SCAFRS precipitation. The contributions of moisture originating from BSC and eastern China to southern China precipitation after the onset of SCSSM are 21% and 18%, respectively. 展开更多
关键词 moisture transport Lagrangian method southern China annually FIRST RAINY season ONSET of the South China Sea summer monsoon
Relationship between the Circumglobal Teleconnection and Silk Road Pattern over Eurasian continent
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作者 Fuli Zhou Renhe Zhang Jinping Han 《科学通报:英文版》 SCIE EI CSCD 2019年第6期374-376,共3页
During boreal summer, two remarkable upper-level wave trains over Eurasia were documented in literature, i.e., Circumglobal Teleconnection (CGT) and Silk Road Pattern (SRP). They are widely discussed because of their ... During boreal summer, two remarkable upper-level wave trains over Eurasia were documented in literature, i.e., Circumglobal Teleconnection (CGT) and Silk Road Pattern (SRP). They are widely discussed because of their influences throughout the entire midlatitude Eurasia. SRP was defined by 200 hPa meridional winds [1]. Enomoto et al.[2] found that the wave train influenced the climate variation over Japan when they detected the mechanism of Bonin High, and then named it as "Silk Road Pattern". SRP has 3 prominent action centers, which are located in west-central Asia, Mongolia and the Far East, respectively [3]. 展开更多
关键词 During BOREAL SUMMER remarkable upper-level located in west-central Asia
Weak Summer Monsoon during the Early Holocene Inferred from the Dingxi Lujiagou Floodplain Lake-Eolian Sand Rhythm due to Solar Impacting 预览
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作者 ZHANG Wanyi ZHANG Huirong +3 位作者 MA Yuan WANG Xiaoyu Steffen MISCHKE ZHANG Chengjun 《地质学报:英文版》 SCIE CAS CSCD 2019年第3期778-779,共2页
Objective Precipitation was the highest in the loess plateau during the Early Holocene 10-8 ka BP even to the period 10-3.0 ka BP in the Kesang cave stalagmite westward Tianshan,Xinjiang,based on large numbers of reco... Objective Precipitation was the highest in the loess plateau during the Early Holocene 10-8 ka BP even to the period 10-3.0 ka BP in the Kesang cave stalagmite westward Tianshan,Xinjiang,based on large numbers of records from paleoclimatic proxies(An et al.,2000;Zhang et al.,2009;Zhang et al.,2018).However,we discovered at first time that floodplain lake-eolian stratigraphical rhythm complex kept in the Lujiagou of Dingxi,Gansu,which was important geological proof to indicate a weak summer monsoon transition period during the Early Holocene in the Chinese Loess Plateau. 展开更多
关键词 SOLAR Impacting WEAK Summer Monsoon
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FROM TRASH TO CASH
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作者 Li Nan 《北京周报:英文版》 2019年第34期16-18,共3页
Summer used to be a slack seas on for Fu Yonglin, owner of Jiuyuan Plastic Products in Taizhou, east China's Zhejiang Province."We used to sell only a few dozen trash bins in summer/ Fu said.
关键词 SUMMER FU Yonglin Jiuyuan
Characterization of low-N responses in maize(Zea mays L.)cultivars with contrasting nitrogen use efficiency in the North China Plain 预览
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作者 LI Xiang-ling GUO Li-guo +9 位作者 ZHOU Bao-yuan TANG Xiang-ming CHEN Cong-cong ZHANG Lei ZHANG Shao-yun LI Chong-feng XIAO Kai DONG Wei-xin YIN Bao-zhong ZHANG Yue-chen 《农业科学学报:英文版》 SCIE CAS CSCD 2019年第9期2141-2152,共12页
Over-use of N fertilizer in crop production has resulted in a series of environmental problems in the North China Plain(NCP).Thus,improvement of nitrogen use efficiency(NUE)in summer maize has become an effective stra... Over-use of N fertilizer in crop production has resulted in a series of environmental problems in the North China Plain(NCP).Thus,improvement of nitrogen use efficiency(NUE)in summer maize has become an effective strategy for promoting sustainable agriculture in this region.Using twenty maize cultivars,plant dry matter production,N absorption and accumulation,yield formation,and NUE in summer maize were investigated under three N levels in two growing seasons.Based on their yield and yield components,these maize cultivars were categorized into four groups including efficient-efficient(EE)cultivars,high-nitrogen efficient(HNE)cultivars,low-nitrogen efficient(LNE)cultivars and nonefficient-nonefficient(NN)cultivars.In both two seasons,the EE cultivars improved grain yield together with increased plant biomass,and enhanced accumulative amounts as well as higher average grain yields than the other cultivar groups under deficient-N conditions.Significant correlations were observed between yield and kernel numbers(KN),dry matter(DM)amount and N accumulation at both post-silking and maturity stages.DM and N accumulation at late growth stage(i.e.,from silking to maturity)contributed largely to the enhanced yield capacity and improved NUE under N-deficient conditions.Compared with the NN cultivars,the EE cultivars also showed increased N assimilation amount(NAA)and N remobilization content(NRC),and elevated N remobilization efficiency(NRE),NUE and nitrogen partial factor productivity(PFPN).Our investigation has revealed N-associated physiological processes and may provide guidance for cultivation and breeding of high yield and NUE summer maize under limited N conditions in the NCP. 展开更多
关键词 summer MAIZE N deficiency yield dry matter production N ACCUMULATIVE AMOUNT
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杭州市城市建筑区夏季地表温度特征分析 预览
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作者 顾春墚 唐伟 桑玉田 《测绘与空间地理信息》 2019年第4期48-51,共4页
以浙江省杭州市为研究对象,选择Landsat-8遥感数据和Jiménez-Muoz单通道算法进行地表温度遥感反演,同时结合地理国情数据分类结果数据,对杭州市城市建筑区域地表温度进行综合分析。通过反演的地表温度结果和区域统计分析,得出了杭... 以浙江省杭州市为研究对象,选择Landsat-8遥感数据和Jiménez-Muoz单通道算法进行地表温度遥感反演,同时结合地理国情数据分类结果数据,对杭州市城市建筑区域地表温度进行综合分析。通过反演的地表温度结果和区域统计分析,得出了杭州市2016夏季地表温度的空间分布特征。结果表明:杭州市城区部分的拱墅区、下城区、江干区、上城区和滨江区等区域,城市建筑温度整体较高;余杭区中部、萧山区中部和东北部、西湖区北部区域城市建筑温度较高;城区西部建筑区域温度相对较低。地表温度的极大值出现在拱墅区,为55.64℃;极小值出现在余杭区,为25.68℃。 展开更多
关键词 杭州市 夏季 城市建筑 地表温度 空间分布特征
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天津市2018年夏季农业气象条件分析 预览 被引量:2
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作者 谢均 曹经福 宫志宏 《天津农业科学》 CAS 2019年第2期87-90,共4页
本文对天津市2018年夏季(6—8月)气象条件进行分析,各区季平均气温在26.2(蓟州)~28.6℃(市区)之间,全市季内平均气温(27.4℃)较历史同期增加1.8℃,为1951年以来最高值;各区季平均降水量在354.2(滨海新区)~682.8(蓟州)mm,全市季平均降水... 本文对天津市2018年夏季(6—8月)气象条件进行分析,各区季平均气温在26.2(蓟州)~28.6℃(市区)之间,全市季内平均气温(27.4℃)较历史同期增加1.8℃,为1951年以来最高值;各区季平均降水量在354.2(滨海新区)~682.8(蓟州)mm,全市季平均降水量(470.1mm)较历史同期增加102.2mm;各区季平均日照时数在610.5(武清)~726.2h(滨海新区南部)之间,全市季平均日照时数(666.5h)较历史同期增加13.0h。结合农业生产,6月下旬的降水为夏收夏种工作提供了较好的墒情条件,盛夏水分和热力条件总体匹配较好,水稻、棉花、玉米等作物长势良好,7月份中下旬出现的几次强降水天气对农业生产总体影响不大,总体来看,2018年夏季的农业气象条件利大于弊。本文还根据秋季(9—11月)气候背景、影响秋季大气环流的海洋、冰、雪等的变化,结合气候模式对区域内秋季气象条件进行了预测,并对农事生产提供了相应的建议。 展开更多
关键词 夏季 气象条件 天津
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基于夏季小气候效应的杭州街道适应性设计策略研究 预览
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作者 杨小乐 金荷仙 +1 位作者 彭海峰 陈楚文 《风景园林》 2019年第2期100-104,共5页
随着城市热岛效应日趋严重,小尺度公共空间的气候研究已成为风景园林学科的研究热点之一。选取杭州市文一西路和古墩路作为实测对象,于2017年8月对各测点空间的空气温度、相对空气湿度、太阳辐射强度、风速风向进行测定,分析小气候因子... 随着城市热岛效应日趋严重,小尺度公共空间的气候研究已成为风景园林学科的研究热点之一。选取杭州市文一西路和古墩路作为实测对象,于2017年8月对各测点空间的空气温度、相对空气湿度、太阳辐射强度、风速风向进行测定,分析小气候因子日变化趋势,并运用Rayman1.2模型评价人体舒适度,针对性提出街道空间小气候适应性设计策略。研究表明,尽可能设定与城市主导风平行或接近的街道朝向,通过人为增建遮阴空间、调控街道界面小气候一致、采用植物或绿色建筑材料、增设道路中央景观界面,且当人行道及机非分隔绿带分别种植落叶、常绿乔木,设五条绿带,选用乔—灌—草复层结构,同时增设垂直绿化时,能够有效缓解夏季极端热感受,从而营建舒适健康的城市街道空间。 展开更多
关键词 风景园林 小气候 街道 设计策略 夏季 杭州
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