张浩鑫,李维京,李伟平. 2017. 春夏季青藏高原与伊朗高原地表热通量的时空分布特征及相互联系[J]. 气象学报, ():-, doi:10.11676/qxxb2017.002
春夏季青藏高原与伊朗高原地表热通量的时空分布特征及相互联系
Spatial and temporal distribution characteristics of boreal spring and summer time surface heat fluxes over both Tibetan Plateau and Iranian?plateau and their relationships
投稿时间:2016-06-05  最后修改时间:2016-07-18
DOI:10.11676/qxxb2017.002
中文关键词:  青藏高原,伊朗高原,地表感热通量,地表潜热通量,年际变化,年代际变化
英文关键词:Tibetan Plateau, Iranian?Plateau, Surface sensible heat flux, Surface latent heat flux, Interannual variation, Interdecadal variation
基金项目:国家重点基础研究发展计划;国家自然科学基金
作者单位E-mail
张浩鑫 中国气象科学研究院 792099686@qq.com 
李维京 国家气候中心 liwj@cma.gov.cn 
李伟平 国家气候中心 liwp@cma.gov.cn 
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中文摘要:
      伊伊朗高原和青藏高原热力作用对东亚区域气候具有重要影响。基于1979年-2014年欧洲中心ERA-interim月平均再分析地表热通量资料,分析了春夏季青藏高原与伊朗高原地表热通量的时空分布特征以及春夏季青藏高原与伊朗高原地表热通量之间的关系。结果表明,春夏季青藏高原与伊朗高原地表热通量在季节、年际和年代际尺度上具有不同的时空分布特征。对于青藏高原,春夏季地表感热呈西部大东部小、地表潜热呈东部大西部小的空间分布;地表感热在春季最大且大于地表潜热,地表潜热在夏季最大且大于地表感热。在年际时间尺度上,春夏季青藏高原地表热通量异常的年际变化在东、西部是不一致的,在高原西部,地表感热与潜热有较好的负相关关系。青藏高原地表感热异常具有很好的持续性,当春季地表感热较强(弱)时,夏季高原地表感热同样较强(弱)。青藏高原东部与西部地表热通量的年代际变化有明显差异,春(夏)季青藏高原东部地表感热有显著的年代际减弱趋势,在1998(2001)年发生年代际转折,由正异常转为负异常;而高原西部地表感热在春季有显著的增加趋势,在2003年发生年代际转折,由负异常转为正异常。高原东部地表潜热仅在春季为显著减弱趋势,在2003年出现年代际转折,由正异常转为负异常;高原西部地表潜热在春夏季都有显著减弱趋势,年代际转折出现在21世纪初,由正异常转为负异常。对于伊朗高原,春夏季地表热通量的空间分布在整个区域较一致,地表感热在夏季最大,地表潜热在春季大、夏季小,但各季节地表感热都大于地表潜热。相对于青藏高原地表感热,伊朗高原地表感热在各月都更大。在年际时间尺度上,春夏季伊朗高原各区域地表热通量异常的年际变化较一致;地表感热与潜热有很强的负相关关系;伊朗高原地表感热、潜热异常都具有持续性,当春季地表感热(潜热)通量较强(弱)时,夏季地表感热(潜热)通量同样较强(弱)。伊朗高原北部与南部地表热通量的年代际变化存在差异。其中,春夏季伊朗高原北部地表感热(潜热)呈显著增加(减弱)趋势,在20世纪末发生了年代际转折,春夏季北部地表感热(潜热)由负(正)异常转为正(负)异常。而伊朗高原南部春夏季热通量无显著变化趋势,但春季地表感热、潜热与夏季地表感热同样在20世纪末存在年代际转折,地表感热(潜热)由负(正)异常转为正(负)异常。春夏季两个高原地区地表热通量的关系主要表现为:就春季同期变化而言,伊朗高原地表感热与青藏高原西部地表感热具有同位相变化关系,与青藏高原东部地表感热具有反相变化关系,伊朗高原地表潜热与青藏高原东部地表潜热具有同位相变化关系;就非同期变化而言,春季伊朗高原地表感热与夏季青藏高原东部地表感热存在反相变化关系。
英文摘要:
      :Elevated heat sources over the Tibetan Plateau (TP) and the Iranian?plateau (IP) have significant impacts on east Asian climate. By using monthly mean surface heat fluxes inthe ERA-interim monthly mean surface heat fluxes reanalysis data spanning from 1979 to 2011, surface thermal characteristics during boreal spring and summer time over both TP and IP and their relationships were analyzed. The results show that the basic spatial and temporal characteristics of surface heat fluxes over TP and IP are different in spring and summer time,and surface heat fluxes in specificdifferent regions over these two plateaus exhibithave different characteristics at the interannual and interdecadal time scales. Over TP, spring and summer western surface sensible heat flux (SH) in the western part is stronger than that in the eastern part during spring and summer, the situation of surface latent heat flux (LH) is just the opposite, stronger in the eastern part.SH peaks in spring and exceeds LH before summer, while LH outweighs SH in summer.At the interannual time scale,the SH is negatively correlated with LH in western TP during during spring and summer,and the SH anomaly over western TP persists from spring to summer. At the interdecadal scale, there is a significant difference ofin surface heat fluxes between eastern and western parts of TP . The sSpring and (summer)SH over eastern TP exhibits a significant decreasing trend and experiences an interdecadal change in 1998(2001), switching from positive to negativeanomaly. However, the sspring SH over western TP exhibits a significant increasing trend and a nnegative-to-positive interdecadal change in 2003, switching from negative to positive anomaly. The LHover eastern TP displays a significant decreasing trend only in spring and exhibits a npositive-to-negative interdecadal change in 20053, switching from positive to negative?anomaly. The LH over western TP exhibits a significant decreasing trend both in spring and summer and an interdecadal change in the beginning of the 21st century2005, switching from positive to negativeanomaly.Over IP, SH、LH are uniformly distributed during spring and summer,SH peaks in summer, LH is strong in spring but weak in summer and it is smaller than SH year round. SH over IP is stronger than SH over TP in each season.At the interannual time scale, the sspring and summer SH (LH) anomaly over the entire IP are uniformly positive (negative); There is a significantly negative correlation between SH and LH over IP; The SH (LH) anomaly over IP hasshows good persistence. A significant difference in surface heat fluxes between northern and southern parts of IPexists at the interdecadal time scale. The spring and summer SH (LH) over northern IP exhibits a significant increasing (decreasing) trend and experiences an interdecadal shift in the end of the 20th century, the anomaly of SH (LH) switches from negative (positive) to positive (negative).But tThere is neithero significant trend norinterdecadal changein the SH and LH over southern IP during spring orand summer.But spring and summer SH over southern IP have a negative-to-positive interdecadal change,spring LH has a positive-to-negative interdecadal changeatthe end of the 20th century.The relationships between surface heat fluxes over these two Plateaus are as follows: the SH over IP is positively correlated with the SH over western TP and is negatively correlated withthe SH over eastern TP in spring,the LH over IP is positively correlated withthe LH over eastern TP in spring; the SH over IP in spring is negatively correlated with the SH over eastern TP during the following summer.
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