The Global Subduction/Obduction Rates: Their Interannual and Decadal Variability

The Global Subduction/Obduction Rates: Their Interannual and Decadal Variability
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全球俯冲/仰冲速率:其年际和年代际变化

DOI:
10.1175/2011jcli4228.1
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发表时间:
2012-02
期刊:
影响因子:
4.9
通讯作者:
Huang, Rui Xin
Huang, Rui Xin
中科院分区:
地球科学2区
文献类型:
--
作者:
Liu, Ling Ling;Huang, Rui Xin

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使用简单海洋数据同化(SODA)输出,研究了全球海洋的通风,包括俯冲和仰冲。1959年至2006年期间的全球平均俯冲速率估计为505.8 Sv(1 Sv = 10(6)m(3)s(-1)),而相应的全球仰冲速率估计为482.1 Sv。年俯冲/仰冲速率在年际和年代际时间尺度上变化很大。在过去的50年里,全球俯冲速率估计增加了7.6%,而仰冲速率估计增加了9.8%。这种趋势可能是微不足道的,因为与海洋数据同化产生的数据相关的误差可能高达10%。然而,引起这些趋势的一个主要物理机制主要与南大洋的变化有关。虽然南大洋在全球俯冲和仰冲速率及其变化方面发挥着关键作用,但南大洋和赤道地区都是水团形成/侵蚀的重要场所。
Ventilation, including subduction and obduction, for the global oceans was examined using Simple Ocean Data Assimilation (SODA) outputs. The global subduction rate averaged over the period from 1959 to 2006 is estimated at 505.8 Sv (1 Sv = 10(6) m(3) s(-1)), while the corresponding global obduction rate is estimated at 482.1 Sv. The annual subduction/obduction rates vary greatly on the interannual and decadal time scales. The global subduction rate is estimated to have increased 7.6% over the past 50 years, while the obduction rate is estimated to have increased 9.8%. Such trends may be insignificant because errors associated with the data generated by ocean data assimilation could be as large as 10%. However, a major physical mechanism that induced these trends is primarily linked to changes in the Southern Ocean. While the Southern Ocean plays a key role in global subduction and obduction rates and their variability, both the Southern Ocean and equatorial regions are critically important sites of water mass formation/erosion.
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