Changes in the global hydrological-cycle inferred from ocean salinity
Changes in the global hydrological-cycle inferred from ocean salinity
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DOI：
10.1029/2010gl044222
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发表时间：
2010-09-22
影响因子：
5.2
通讯作者：
Church, John A.
中科院分区：
文献类型：
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作者：
Helm, Kieran P.;Bindoff, Nathaniel L.;Church, John A.
使用全球原位观测数据集，我们计算了1970年和2005年之间的海洋密度表面的盐度变化。这显示了一种全球模式，即海洋上层盐度最高层附近的盐度增加（平均深度约为100米），而中间盐度最低层附近的盐度减少（平均深度约为700米）。盐度的变化意味着自1970年以来，两半球中低纬海洋的降水-蒸发（P-E）减少了3 +/- 2%，北方高纬度增加了7 +/- 4%，南大洋增加了16 +/- 6%。这种高纬度地区降水量增加而亚热带地区降水量减少的模式反映在陆地记录和短期卫星记录中。气候变化对海洋盐度的大气信号的量化支持了模型预测，并扩大了地球水循环加速的越来越多的证据。引用：Helm，K. P.，N. L. Binadian和J. A. Church（2010），从海洋盐度推断的全球水文循环变化，地球物理学。保留信函：37，L18701，doi：10.1029/2010GL044222。
Using global datasets of in situ observations, we calculate salinity changes on ocean-density surfaces between 1970 and 2005. This reveals a global pattern of increased salinities near the upper-ocean salinity-maximum layer (average depth of similar to 100 m) and decreased salinities near the intermediate salinity minimum (average depth of similar to 700 m). The salinity changes imply a 3 +/- 2% decrease in precipitation-minus evaporation (P-E) over the mid and low latitude oceans in both hemispheres, a 7 +/- 4% increase in the Northern Hemisphere high latitudes, and a 16 +/- 6% increase in the Southern Ocean since 1970. This pattern of increased precipitation at high latitudes and decreased precipitation in the subtropics is reflected in both land records and in the short satellite records. The quantification of the atmospheric signal of climate change on ocean salinity supports model projections, and extends the growing evidence for an acceleration of the Earth's water cycle. Citation: Helm, K. P., N. L. Bindoff, and J. A. Church (2010), Changes in the global hydrological-cycle inferred from ocean salinity, Geophys. Res. Lett., 37, L18701, doi: 10.1029/2010GL044222.