The age of Yellow River water in the Bohai Sea
The age of Yellow River water in the Bohai Sea
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渤海黄河水年龄
DOI：
10.1029/2012jc008263
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发表时间：
2012-11-08
影响因子：
3.6
通讯作者：
Gao, Huiwang
中科院分区：
文献类型：
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作者：
Liu, Zhe;Wang, Haiyan;Gao, Huiwang
为了定量了解大江大河向半封闭海域排放的溶解物质的输运时间，采用面向组分的年龄和停留时间理论(CART)和颗粒示踪法计算了黄河水在渤海的年龄。黄河水对整个渤海的平均年龄为3.0年。水龄的空间变化明显，黄河口附近为1.2年，辽东湾为3.9年。然而，水龄的时间变化并不显著。在河口释放的水颗粒只需几天就能到达河口地区。黄河河口附近的大水龄(1.2年)是由于原始水粒的存在而引起的，这些水粒最初离开了该地区，但又回到了该地区。如果没有黄河水从黄海到渤海的回归，整个渤海的黄河水的平均年龄下降到1.2年。在不考虑潮汐强迫的情况下，计算得到的水龄减少了50%以上，说明潮汐强迫在控制渤海黄河水的年龄中起着最主要的作用。不考虑风的计算表明，黄河水的年龄增加了20-30%，表明风的强迫是黄河水年龄的次要因素。黄河流量和热力层结的变化对黄河水的年龄影响有限。
To quantitatively understand the transport timescales of dissolved material discharged from large rivers into a semienclosed sea, the age of Yellow River water in the Bohai Sea was calculated with the constituent‐oriented age and residence time theory (CART) and particle‐tracking method. Yellow River water has a mean age of 3.0 years for the entire Bohai Sea. The spatial variation of the water age is significant: 1.2 years near the Yellow River estuary but 3.9 years in the Liaodong Bay. However, the temporal variation in water age is insignificant. The water particles released at the river mouth need only several days to reach the estuary area. The great water age (1.2 years) near the Yellow River estuary is caused by the presence of old water particles that initially left this area but returned to this area again. Without the reentry of Yellow River water from the Yellow Sea to the Bohai Sea, the mean age of Yellow River water in the entire Bohai Sea decreases to 1.2 years. Calculations without tidal forcing give a reduction in water age by more than 50%, suggesting that tidal forcing plays the most dominant role in controlling the age of Yellow River water in the Bohai Sea. Calculations without winds give an increase in water age by 20–30%, suggesting that wind forcing is secondary factor to the age of Yellow River water. Changes in discharge of the Yellow River and in thermal stratification have limited influence on the age of Yellow River water.