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Global Land Surface Climate Analysis Based on the Calculation of a Modified Bowen Ratio

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A modified Bowen ratio (BRm),the sign of which is determined by the direction of the surface sensible heat flux,was used to represent the major divisions in climate across the globe,and the usefulness of this approach was evaluated.Five reanalysis datasets and the results of an offline land surface model were investigated.We divided the global continents into five major BRm zones using the climatological means of the sensible and latent heat fluxes during the period 1980-2010:extremely cold,extremely wet,semi-wet,semi-arid and extremely arid.These zones had BRm ranges of (-∞,0),(0,0.5),(0.5,2),(2,10) and (10,+∞),respectively.The climatological mean distribution of the Bowen ratio zones corresponded welt with the Ktppen-like climate classification,and it reflected well the seasonal variation for each subdivision of climate classification.The features of climate change over the mean climatological BRm zones were also investigated.In addition to giving a map-like classification of climate,the BRm also reflects temporal variations in different climatic zones based on land surface processes.An investigation of the coverage of the BRm zones showed that the extremely wet and extremely arid regions expanded,whereas a reduction in area was seen for the semi-wet and semi-arid regions in boreal spring during the period 1980-2010.This indicates that the arid regions may have become drier and the wet regions wetter over this period of time.

climate classificationsurface turbulent heat fluxclimate change

Bo HAN、Shihua L(U)、Ruiqing LI、Xin WANG、Lin ZHAO、Cailing ZHAO、Danyun WANG、Xianhong MENG

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Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China

College of Atmospheric Sciences,Chengdu University of Information Technology Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu 610225,China

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China

Inner Mongolia Autonomous Regional Meteorological Observatory,Hohhot 010051,China

Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,China

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This research was jointly funded by the Research Project for Public Welfare Industry (Meteorology) from the Ministry of Science National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaOpening Research Foundation of the Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions

GYHY20150600191537214416750154140507941405020LPCC201504

2017

10.1007/s00376-016-6175-y

大气科学进展(英文版)
中国科学院大气物理研究所

大气科学进展(英文版)

CSTPCDCSCDSCI
影响因子：0.741
ISSN：0256-1530
年,卷(期)：2017.34(5)
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