期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 22, 页码 7891-7897出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062039
关键词
drought
资金
- Australian Research Council [CE11E0098]
- National Natural Science Foundation of China [91125018]
- China Scholarship Council [201306210089]
Higher temperatures are usually reported during meteorological drought and there are two prevailing interpretations for this observation. The first is that the increase in temperature (T) causes an increase in evaporation (E) that dries the environment. The second states that the decline in precipitation (P) during drought reduces the available water thereby decreasing E, and in turn the consequent reduction in evaporative cooling causes higher T. To test which of these interpretations is correct, we use climatic data (T, P) and a recently released database (CERES) that includes incoming and outgoing shortwave and longwave surface radiative fluxes to study meteorological drought at four sites (parts of Australia, US, and Brazil), using the Budyko approximation to calculate E. The results support the second interpretation at arid sites. The analysis also showed that increases in T due to drought have a different radiative signature from increases in T due to elevated CO2.
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