Suspended particles in the Canada Basin from optical and bottle data, 2003-2008
Suspended particles in the Canada Basin from optical and bottle data, 2003-2008
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DOI：
10.5194/os-6-799-2010
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发表时间：
2010-01-01
期刊：
影响因子：
3.2
通讯作者：
McLaughlin, F. A.
中科院分区：
文献类型：
--
作者：
Jackson, J. M.;Allen, S. E.;McLaughlin, F. A.
预计北极变暖造成的海岸侵蚀、上升流和河流径流增加将增加北冰洋悬浮颗粒的浓度。在这里，我们分析了原位透射计和荧光计的数据，从2003年到2008年的夏天和瓶衍生的颗粒有机碳（POC）和总悬浮固体（TSS）的测量采样在2006年和2007年的夏天，从加拿大盆地和周围的货架。我们将我们的研究区域分为五个区域，占显着的空间变异性，发现最高的衰减，POC和TSS值观察沿着博福特陆架和最低值位于沿着加拿大盆地东部陆架。然后，我们探讨了POC和TSS与光束衰减系数的相关性，以评估从存档的透射仪数据估计POC浓度的可行性。POC（但不是TSS）和衰减相关性良好的北风岭，在加拿大盆地内部，和沿着加拿大盆地东部大陆架。TSS和POC均与整个博福特陆架沿着的衰减没有很好的相关性。对衰减和荧光数据进行了年际比较。我们没有发现从2003年到2008年夏季衰减增加的证据，尽管没有统计学意义，但在北风脊的上部25米和博福特大陆架东部的25- 100米层（包括叶绿素最大值）以及加拿大盆地内，衰减似乎随着时间的推移而减少。在加拿大盆地内部，地下叶绿素最大值以每年3.2米的速度从2003年的平均45米加深到2008年的61米，这是北极气候变化如何影响其生态的一个例子。
It is expected that coastal erosion, upwelling, and increased river runoff from Arctic warming will increase the concentration of suspended particles in the Arctic Ocean. Here we analyze in situ transmissometer and fluorometer data from the summers of 2003 through 2008 and bottle-derived particulate organic carbon (POC) and total suspended solids (TSS) measurements sampled in the summers of 2006 and 2007 from the Canada Basin and surrounding shelves. We divided our study area into five regions to account for the significant spatial variability and found that the highest attenuation, POC and TSS values were observed along the Beaufort shelf and the lowest values were located along the eastern shelf of the Canada Basin. We then explored the correlation of POC and TSS with beam attenuation coefficients to assess the viability of estimating POC concentrations from archived transmissometer data. POC (but not TSS) and attenuation were well-correlated over the Northwind Ridge, in the Canada Basin interior, and along the eastern shelf of the Canada Basin. Neither TSS nor POC were well-correlated with attenuation along the entire Beaufort shelf. An interannual comparison of the attenuation and fluorescence data was done. We found no evidence of increasing attenuation from the summers of 2003 through 2008 and, although not statistically significant, it even appeared that attenuation decreased over time in the upper 25m of the Northwind Ridge and in the 25-100m layer (that includes the chlorophyll maximum) of the eastern Beaufort shelf and within the Canada Basin. In the Canada Basin interior, the subsurface chlorophyll maximum deepened at a rate of 3.2m per year from an average of 45m in 2003 to 61m in 2008, an example of how changes to the Arctic climate are impacting its ecology.