SPATIO-TEMPORAL VARIATION OF ACTUAL EVAPOTRANSPIRATION AND ITS RELATION WITH CLIMATE PARAMETERS IN THE PEARL RIVER BASIN, CHINA     

吴萍  李修仓  苏布达  占明锦  王艳君  姜彤 《热带气象学报(英文版)》2017,23(1):81-90

Spatio-temporal variation of actual evapotranspiration (ETa) in the Pearl River basin from 1961 to 2010 are analyzed based on daily data from 60 national observed stations. ETa is calculated by the Advection-Aridity model (AA model) in the current study, and Mann–Kendall test (MK) and Inverse Distance Weighted interpolation method (IDW) were applied to detect the trends and spatial variation pattern. The relations of ETa with climate parameters and radiation / dynamic terms are analyzed by Person correlation method. Our findings are shown as follows: 1) Mean annual ETa in the Pearl River basin is about 665.6 mm/a. It has significantly decreased in 1961–2010 at a rate of -24.3 mm/10a. Seasonally, negative trends of summer and autumn ETa are higher than that of spring and winter. 2) The value of ETa is higher in the southeast coastal area than in the northwest region of the Pearl River basin, while the latter has shown the strongest negative trend. 3) Negative trends of ETa in the Pearl River basin are most probably due to decreasing radiation term and increasing dynamic term. The decrease of the radiation term is related with declining diurnal temperature range and sunshine duration, and rising atmospheric pressure as well. The contribution of dynamic term comes from increasing average temperature, maximum and minimum temperatures in the basin. Meanwhile, the decreasing average wind speed weakens dynamic term and finally, to a certain extent, it slows down the negative trend of the ETa.  相似文献   

中国区域性极端降水事件及人口经济暴露度研究          下载免费PDF全文

景丞  姜彤  王艳君  陈静  蹇东南  罗岚心  苏布达 《Acta Meteorologica Sinica》2016,74(4):572-582

This paper tests the idea of substituting the atmospheric observations with atmospheric reanalysis when setting up a coupled data assimilation system.The paper focuses on the quantification of the effects on the oceanic analysis resulted from this substitution and designs four different assimilation schemes for such a substitution.A coupled Lorenz96 system is constructed and an ensemble Kalman filter is adopted.The atmospheric reanalysis and oceanic observations are assimilated into the system and the analysis quality is compared to a benchmark experiment where both atmospheric and oceanic observations are assimilated.Four schemes are designed for assimilating the reanalysis and they differ in the generation of the perturbed observation ensemble and the representation of the error covariance matrix.The results show that when the reanalysis is assimilated directly as independent observations,the root-mean-square error increase of oceanic analysis relative to the benchmark is less than 16%in the perfect model framework;in the biased model case,the increase is less than 22%.This result is robust with sufficient ensemble size and reasonable atmospheric observation quality(e.g.,frequency,noisiness,and density).If the observation is overly noisy,infrequent,sparse,or the ensemble size is insufficiently small,the analysis deterioration caused by the substitution is less severe since the analysis quality of the benchmark also deteriorates significantly due to worse observations and undersampling.The results from different assimilation schemes highlight the importance of two factors:accurate representation of the error covariance of the reanalysis and the temporal coherence along each ensemble member,which are crucial for the analysis quality of the substitution experiment.  相似文献   

全国喀斯特石林地质地貌研究成果报告会在长沙召开     

王艳君 《地理学报》2009,64(1)

2008年11月22-23日,全国喀斯石林地质地貌研究成果报告会在湖南长沙召开.会议由中国地质科学院地质公园研究中心和湖南省国土资源厅联合主办,湖南省国土资源厅地质环境处、湖南省地质环境监测总站共同承办.  相似文献   

东海产长木叶鲽的年龄与生长     

王艳君  多部田修  任一平 《中国海洋大学学报(自然科学版)》1999,(4)

研究了东海产长木叶鲽的年龄与生长等生物学特性。样品取自１９９６ 年４ 月～１９９８ 年１１月,日本以西底拖网渔业在长崎鱼市场上岸的渔获物共２ ５８４ 尾。采用耳石进行年龄鉴定。体长与耳石径的关系,雌雄间有显著性差异。耳石上轮纹每年１～３ 月份形成一次。周龄的推定体长,５＋ 龄以上,雌性偏大  相似文献   

2000年中国地质学会部分学术活动     

王艳君 《水文地质工程地质》2000,27(3):37

序号会议名称会议内容人数时间天数地点承办单位及合办单位主办单位12 0 0 0勘探地球物理与国土资源大调查学术讨论会研讨勘探地球物理在国土资源大调查中之区域地质调查、矿产资源调查及水工环勘查等三大领域中的任务目标 ,存在问题与对策思路等15 0下半年 4- 5待定 中国地球物理学会物探委员会 地球物理勘探专委会2 地质灾害防治学术研讨会学术交流 ;换届 ,选举新一届理事会成员 10 0 9月 3待定地质灾害研究会地质灾害研究会3全国第 15届旅游地学年全暨镇江市旅游风景名胜资源开发战略研讨会总结与探讨旅游地学理论体系 :展望 2 1世纪旅游…  相似文献   

1961-2003年间鄱阳湖流域气候变化趋势及突变分析   总被引：21，自引：2，他引：19  

郭华  姜彤  王国杰  苏布达  王艳君 《湖泊科学》2006,18(5):443-451

本文利用1961-2003年间鄱阳湖流域14个气象站的气温、降水量、蒸发量等观测数据和8个主要水文站的流量数据,研究该时段内鄱阳湖流域的气候变化趋势、突变及其空间分布的差异．研究表明,鄱阳潮流域气温和降水均在1990年发生突变,继而呈现显著的上升趋势;在季节变化上,冬季平均气温在1986年发生突变,增温显著;夏季降水量和夏季暴雨频率均在1992年发生突变增加,暴雨频率增加是夏季降水量增加的主要原因;蒸发皿蒸发量和参照蒸散量均呈现显著下降趋势,该变化在夏季尤为明显．上述变化趋势均以1990s最为显著,这与长江流域气候变化趋势基本一致．在空间分布上,饶河水系、信江水系和赣江下游等气候变化更为显著．笔者认为,鄱阳湖流域气候变化在长江流域中比较突出．该流域1990s暖湿气候在加强;气温的升高、降水量和暴雨频率的增加以及蒸发量的下降强化了五河流量的增加趋势,由此可大致判定鄱阳湖流域气候变化与洪涝灾害之间可能存在的关系,这可为理解气候变化在该流域的响应和预测该流域未来可能的洪涝灾害提供依据．  相似文献   

鄱阳湖流域1955-2002年径流系数变化趋势及其与气候因子的关系   总被引：3，自引：2，他引：1  

郭华  苏布达  王艳君  姜彤 《湖泊科学》2007,19(2):163-169

近些年来,由于人类活动的影响,湖泊普遍出现了萎缩、水位下降、水量锐减、水质污染等问题,研究湖泊最低生态水位,确保湖泊所必须的最小水量,对于解决我国湖泊生态退化问题具有重要意义.本文提出综合指标法来计算湖泊最低生态水位.根据博斯腾湖具体情况选取天然水位资料、湖泊形态和芦苇3种指标为依据分别计算博斯腾湖的最低生态水位,计算结果分别为1047.06 m,1047.41 m和1047.20 m,然后通过综合分析以上这3种指标所占权重,进行加权计算,最终确定博斯腾湖最低生态水位为1047.16 m,通过分析表明1047.16 m作为博斯腾湖最低生态水位是合理的,综合指标法作为湖泊最低生态水位的计算方法切实可行.  相似文献   

1960年以来长江流域太阳总辐射的时空变化     

刘长坤  王艳君  郭媛 《南京气象学院学报》2012,4(3):233-240

基于长江流域147个站点的气象数据,利用气候学计算方法估算1960年以来的太阳总辐射数据,运用线性回归和相关分析等方法,探讨1960年以来太阳总辐射在长江流域的时空变化特征,并分析太阳总辐射的影响因子.结果表明:太阳总辐射在整个长江流域(除去上游源头区金沙江流域)自东向西递减,且上游地区变化波动大,中下游地区下降趋势显著;自1960年以来太阳总辐射在长江流域呈现下降趋势,1990年以后开始呈现上升趋势;近50a来太阳总辐射的减少趋势与云量和大气水汽含量没有显著相关性.  相似文献   

井中磁测：定位,矢分量及磁性地层学     

Morr.  WA 王艳君 《物探化探译丛》1996,(A00):73-76

  相似文献   

APPLICATION OF LEAST MEDIAN OF SQUARED ORTHOGONAL DISTANCE (LMD) AND LMD BASED REWEIGHTED LEAST SQUARES (RLS) METHODS ON THE STOCK RECRUITMENT RELATIONSHIP     

王艳君  刘群 《中国海洋湖沼学报》1999,17(1):70-78

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｍｏｓｔｉｍｐｏｒｔａｎｔａｎｄｇｅｎｅｒａｌｌｙｍｏｓｔｄｉｆｆｉｃｕｌｔｐｒｏｂｌｅｍｉｎｂｉｏｌｏｇｉｃａｌａｓｓｅｓｓｍｅｎｔｏｆｆｉｓｈｅｒｉｅｓｉｓｐｒｏｂａｂｌｙｔｈｅｒｅｌａｔｉｏｎｓｈｉｐｂｅｔｗｅｅｎｓｔｏｃｋａｎｄｒｅｃｒｕｉｔｍｅｎｔ(Ｈｉｌｂｏｒｎｅｔａｌ.,1992).Ａｎａｌｙｓｉｓｏｆｓｔｏｃｋｒｅｃｒｕｉｔｍｅｎｔ(ＳＲ)ｄａｔａｉｓｍｏｓｔｏｆｔｅｎｄｏｎｅｂｙｆｉｔｔｉｎｇｖａｒｉｏｕｓｃｕｒｖｅｓｏｆＳＲｒｅｌａｔｉｏｎｓｈｉｐｔｏｔｈ…  相似文献