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Abstract
In this study, we focus on changes in three important components of the hydrological-cycle in the Haihe
River basin (HRB) during 1957-2005: precipitation (Prep), actual evaportranspiration (ETa), and pan
evaporation (PE)- a measure of potential evaporation. The changes in these components have been evaluated
in relation to changes in the East Asian summer monsoon.
Summer Prep for the whole basin has decreased significantly during 1957-2005. Recent weakening of the
convergence of the integrated water vapor flux, in combination with a change from cyclonic-like large-scale
circulation conditions to anti-cyclonic-like conditions, led to the decrease in the summer Prep in the HRB.
ETa is positively correlated with Prep on the interannual timescale. On longer timescales, however, ETa
is less dependent on Prep or the large-scale circulation. We found negative trends in ETa when the ERA40
reanalysis data were used, but positive trends in ETa when the NCEP/NCAR reanalysis data were used.
PE declined during the period 1957-2001. The declining of PE could be explained by a combination of
declining solar radiation and declining surface wind. However, the declining solar radiation may itself be
related to the weakening winds, due to weaker dispersion of pollution. If so, the downward trend of PE may
be mainly caused by weakening winds.
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Citation
OU Tinghai, LIU Yanxiang, CHEN Deliang, David RAYNER, ZHANG Qiang, GAO Ge, XIANG Weiguo. 2011: The Influence of Large-Scale Circulation on the Summer Hydrological Cycle in the Haihe River Basin of China. Journal of Meteorological Research, 25(4): 517-526.
OU Tinghai, LIU Yanxiang, CHEN Deliang, David RAYNER, ZHANG Qiang, GAO Ge, XIANG Weiguo. 2011: The Influence of Large-Scale Circulation on the Summer Hydrological Cycle in the Haihe River Basin of China. Journal of Meteorological Research, 25(4): 517-526.
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OU Tinghai, LIU Yanxiang, CHEN Deliang, David RAYNER, ZHANG Qiang, GAO Ge, XIANG Weiguo. 2011: The Influence of Large-Scale Circulation on the Summer Hydrological Cycle in the Haihe River Basin of China. Journal of Meteorological Research, 25(4): 517-526.
OU Tinghai, LIU Yanxiang, CHEN Deliang, David RAYNER, ZHANG Qiang, GAO Ge, XIANG Weiguo. 2011: The Influence of Large-Scale Circulation on the Summer Hydrological Cycle in the Haihe River Basin of China. Journal of Meteorological Research, 25(4): 517-526.
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