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首页> 外文期刊>Geophysical Research Letters >Contribution of glacier runoff to freshwater discharge into the Gulf of Alaska
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Contribution of glacier runoff to freshwater discharge into the Gulf of Alaska

机译:冰川径流对淡水排入阿拉斯加湾的贡献

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摘要

Watersheds along the Gulf of Alaska (GOA) are undergoing climate warming, glacier volume loss, and shifts in the timing and volume of freshwater delivered to the eastern North Pacific Ocean. We estimate recent mean annual freshwater discharge to the GOA at 870 km~3 yr~(-1). Small distributed coastal drainages contribute 78% of the freshwater discharge with the remainder delivered by larger rivers penetrating coastal ranges. Discharge from glaciers and icefields accounts for 47% of total freshwater discharge, with 10% coming from glacier volume loss associated with rapid thinning and retreat of glaciers along the GOA. Our results indicate the region of the GOA from Prince William Sound to the east, where glacier runoff contributes 371 km~3 yr~(-1), is vulnerable to future changes in freshwater discharge as a result of glacier thinning and recession. Changes in timing and magnitude of freshwater delivery to the GOA could impact coastal circulation as well as biogeochemical fluxes to nearshore marine ecosystems and the eastern North Pacific Ocean.
机译:阿拉斯加湾(GOA)沿岸的流域正在经历气候变暖,冰川体积减少以及输送到北太平洋东部的淡水时间和水量的变化。我们估计最近平均每年向GOA排放的淡水为870 km〜3 yr〜(-1)。沿岸分布的小型排水渠占淡水排放量的78%,其余部分则由穿过沿海地区的较大河流输送。冰川和冰原的排放量占淡水排放总量的47%,其中10%来自与沿GOA冰川快速变薄和后退相关的冰川体积损失。我们的研究结果表明,从威廉王子湾到东部的GOA地区,冰川径流贡献了371 km〜3 yr〜(-1),由于冰川变薄和衰退,该地区很容易受到未来淡水排放量变化的影响。向GOA输送淡水的时间和规模的变化可能会影响沿海环流以及流向近岸海洋生态系统和北太平洋东部的生物地球化学通量。

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