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Satellite evidence for no change in terrestrial latent heat flux in the Three-River Headwaters region of China over the past three decades

机译：satellite evidence for no change in terrestrial latent heat flux in the Three-River Headwaters region of China over the past three decades

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摘要

Terrestrial latent heat flux (LE) in the Three-River Headwaters region (TRHR) of China plays an essential role in quantifying the amount of water evaporation and carbon sink over the high altitude Tibetan Plateau (TP). Global warming is expected to accelerate terrestrial hydrological cycle and to increase evaporation. However, direct field observations are lacking in this region and the long-term variability in LE remains uncertain. In this study, we have revised a semi-empirical Penman LE algorithm based on ground eddy covariance (EC) observations from an alpine grass site and provided new satellite-based evidence to assess LE change in the TRHR during 1982-2010. Our results show that the average annual terrestrial LE in the TRHR is about 38.8 W/m (2) and there is no statistically significant change in annual LE from 1982 to 2010. We also found that during the same time period, terrestrial LE over the east region of the TRHR significantly decreased, on average, by 0.7 W/m (2) per decade, which was driven primarily by the surface incident solar radiation (R (s) ) limitation, offsetting the increased LE over the west region of the TRHR caused by the increased precipitation (P) and soil moisture (SM).
机译：中国三河源头地区（TRHR）的地面潜热通量（LE）在量化高原青藏高原（TP）的水蒸发量和碳汇量方面起着至关重要的作用。预计全球变暖将加速陆地水文循环并增​​加蒸发。但是，该地区缺乏直接的现场观测，并且LE的长期变化仍不确定。在这项研究中，我们基于高山草场的地面涡动协方差（EC）观测值，修订了半经验Penman LE算法，并提供了新的基于卫星的证据来评估1982-2010年期间TRHR中的LE变化。我们的结果表明，TRHR的年平均地面LE约为38.8 W / m（2），并且从1982年到2010年，年LE并没有统计学上的显着变化。我们还发现，在同一时间段内， TRHR东部地区平均每十年平均降低0.7 W / m（2），这主要是受表面入射太阳辐射（R（s））限制的驱动，抵消了西海岸地区LE的增加。降水（P）和土壤水分（SM）增加导致TRHR。

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