A Source–Receptor Perspective on the Polar Hydrologic Cycle: Sources, Seasonality, and Arctic–Antarctic Parity in the Hydrologic Cycle Response to CO2 Doubling
A Source–Receptor Perspective on the Polar Hydrologic Cycle: Sources, Seasonality, and Arctic–Antarctic Parity in the Hydrologic Cycle Response to CO2 Doubling
复制标题
极地水文循环的源-受体视角：水文循环对二氧化碳倍增的响应中的源、季节性和北极-南极平价
DOI：
10.1175/jcli-d-16-0917.1
复制
发表时间：
2017
影响因子：
4.9
通讯作者：
P. Rasch
中科院分区：
文献类型：
--
作者：
Hansi K. A. Singh;C. Bitz;A. Donohoe;P. Rasch
摘要利用全球气候模式中的数值水示踪剂，从源-受体的角度研究极地水气候对二氧化碳引起的气候变暖的响应。虽然在平均状态下，偏远的水汽来源对全年极地降水的贡献要大得多，但当地来源的水汽的增加对于冬季极地降水对温室气体强迫的反应至关重要。总体而言，极地水文气候对二氧化碳引起的气候变暖的响应具有很强的季节性：在北极和南极，本地来源的水分在冬季降水中所占比例较大，而在夏季，偏远来源的水分甚至更占主导地位。秋季和冬季局地蒸发量的增加与海冰的消退相一致，海冰的消退大大增加了这两个季节的局地水汽来源。然而，在夏季，来自更偏远的水汽源区的较大贡献与水汽停留时间的增加和更长的水汽输送长度一致。
AbstractNumerical water tracers implemented in a global climate model are used to study how polar hydroclimate responds to CO2-induced warming from a source–receptor perspective. Although remote moisture sources contribute substantially more to polar precipitation year-round in the mean state, an increase in locally sourced moisture is crucial to the winter season polar precipitation response to greenhouse gas forcing. In general, the polar hydroclimate response to CO2-induced warming is strongly seasonal: over both the Arctic and Antarctic, locally sourced moisture constitutes a larger fraction of the precipitation in winter, while remote sources become even more dominant in summer. Increased local evaporation in fall and winter is coincident with sea ice retreat, which greatly augments local moisture sources in these seasons. In summer, however, larger contributions from more remote moisture source regions are consistent with an increase in moisture residence times and a longer moisture transport length...