Combined surface solar brightening and increasing greenhouse effect support recent intensification of the global land‐based hydrological cycle
Combined surface solar brightening and increasing greenhouse effect support recent intensification of the global land‐based hydrological cycle
复制标题
DOI：
10.1029/2008gl034842
复制
发表时间：
2008-09
影响因子：
5.2
通讯作者：
M. Wild;J. Grieser;C. Schär
中科院分区：
文献类型：
--
作者：
M. Wild;J. Grieser;C. Schär
地表净辐射（地表辐射平衡）是全球水文循环的关键驱动力。在这里，我们提出了 1986 年至 2000 年 15 年期间的一阶趋势估计，这表明陆地表面净辐射每十年迅速增加约 2 Wm−2，而几十年后却没有任何增加的证据。最近的这种增加是由向下的太阳辐射（由于更透明的大气）和向下的热辐射（由于大气温室气体浓度增加）的增加引起的。地表净辐射的正趋势与观察到的陆地降水增加（1986年至2000年间每十年3.5 mmy−1）以及陆基水文循环的相关强化一致。地表净辐射和水文循环的同时变化在皮纳图博火山喷发后的恢复阶段尤其明显，但即使排除皮纳图博火山影响年份，这种变化仍然很明显。
The surface net radiation (surface radiation balance) is the key driver behind the global hydrological cycle. Here we present a first‐order trend estimate for the 15‐year period 1986–2000, which suggests that surface net radiation over land has rapidly increased by about 2 Wm−2 per decade, after several decades with no evidence for an increase. This recent increase is caused by increases in both downward solar radiation (due to a more transparent atmosphere) and downward thermal radiation (due to enhanced concentrations of atmospheric greenhouse‐gases). The positive trend in surface net radiation is consistent with the observed increase in land precipitation (3.5 mmy−1 per decade between 1986 and 2000) and the associated intensification of the land‐based hydrological cycle. The concurrent changes in surface net radiation and hydrological cycle were particularly pronounced in the recovery phase following the Mount Pinatubo volcanic eruption, but remain evident even when discarding the Pinatubo‐affected years.