Macro-scale exhaustion of surface phosphate by dinitrogen fixation in the western North Pacific
Macro-scale exhaustion of surface phosphate by dinitrogen fixation in the western North Pacific
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DOI：
10.1029/2008gl036866
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发表时间：
2009-02-13
影响因子：
5.2
通讯作者：
Kanda, Jota
中科院分区：
文献类型：
--
作者：
Hashihama, Fuminori;Furuya, Ken;Kanda, Jota
在亚热带海洋，营养物浓度往往低于标准分析方法的检测限度。我们采用了一种高度敏感的方法，在42度N和40度S之间和141度E和158度W之间的西太平洋和中太平洋的地表水，除了在赤道区，并检测到硝酸盐+亚硝酸盐和过量的SRP的整体耗尽。然而，一个显着的例外，发现：几乎完全耗尽的SRP（< 10 nM）存在于水平尺度> 2000公里的西副热带北太平洋在夏季和冬季。SRP耗尽是一个升高的二氮固定的结果，这发生在亚洲大陆的高粉尘沉积，可能会提高SRP消费的地区。养分动态，固氮和灰尘沉积之间的耦合产生了极低的P可用性跨越大面积，这似乎是独特的西北太平洋。引文：Hashihama，F.，K. Furuya，S. Kitajima，S.武田，T. Takemura和J. Kanda（2009年），西北太平洋通过固氮作用对表面磷酸盐的宏观消耗，Geophys。保留信函：36，L03610，doi：10.1029/2008GL036866。
In the subtropical oceans, nutrient concentrations are frequently below the detection limits of standard analytical methods. We applied a highly sensitive method to the surface water of the western and central Pacific between 42 degrees N and 40 degrees S and between 141 degrees E and 158 degrees W except in the equatorial zone, and detected overall depletion of nitrate + nitrite and an excess of SRP. However, a remarkable exception was found: an almost complete exhaustion of SRP (< 10 nM) existed at a horizontal scale of > 2000 km in the western subtropical North Pacific in both summer and winter. The SRP exhaustion was a consequence of an elevated dinitrogen fixation, which occurred in areas with high dust deposition from the Asian continent that likely enhanced SRP consumption. A coupling among nutrient dynamics, dinitrogen fixation and dust deposition produces the extremely low P availability spanning a large area, which appears to be unique to the western North Pacific. Citation: Hashihama, F., K. Furuya, S. Kitajima, S. Takeda, T. Takemura, and J. Kanda (2009), Macro-scale exhaustion of surface phosphate by dinitrogen fixation in the western North Pacific, Geophys. Res. Lett., 36, L03610, doi: 10.1029/2008GL036866.