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首页> 外文期刊>Journal of nannoplankton research: A publication of the International Nannoplankton Association >Coccolithophore contribution to sea-surface PIC along a latitudinal transect in the W Pacific sector of the Southern Ocean under non-bloom conditions
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Coccolithophore contribution to sea-surface PIC along a latitudinal transect in the W Pacific sector of the Southern Ocean under non-bloom conditions

机译：在非绽放条件下，沿着南海的W太平洋地区的W太平洋部门的纬度横断面往返海面图片的Coccolthophore贡献

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Coccolithophores are important particulate inorganic carbon (PIC) producers. Their blooms can be detected from satellites as areas of high backscattering (Holligan et al., 1983; Balch et al., 1991). The "Great Calcite Belt" (Balch et al, 2011) is a region of high reflectance during the austral summer between 30° and 60° S that is related to high concentrations of Emiliania huxleyi. We calculated the contribution of E. huxleyi to sea-surface PIC along a latitudinal transect in the Southern Ocean that crosses different fronts of the Antarctic Circumpolar Current (ACC). Coccosphere/coccolith concentrations were below 130x10~3/6x10~6 L~(-1) (Malinverno et al., submitted), representing non-bloom to outer bloom conditions. Speciesspecific coccolith PIC was obtained from morphometric analyses of free coccoliths on SEM images from water samples (volume calculation following Young & Ziveri, 2000). Satellite-derived PIC was estimated from eightday composites from MODIS and SeaWiFS sensors. Our results show that: la) E. huxleyi morphotypes A and C show little latitudinal variation in size and degree of calcification along the ltransect. The coccolith PIC contribution in surface waters lis mainly controlled by the dominant morphotype. lb) In situ and satellite-derived PIC show good agreement in the region between 45-62° S,an area characterized by intermediate coccolithophore concentration and llimited contribution from other biogenic particles. lc) The strong peak in satellite-derived PIC southward lof 62.5°S is not related to a coccolithophore bloom. The lshift in the source of backscattering corresponds to the llocation of the southern ACC front, which separates lcarbonate-dominated waters to the north from opal-dominated waters to the south. Although opal particles have a lmuch lower refractive index than calcite (Balch & Utgof, l2009), abundant fragments of diatom frustules, setae, and lsilicoflagellates can produce a similar high-reflectance lsignal. lSatellite products are an invaluable tool to estimate lglobal PIC, but these should be combined with field lsampling and ecological knowledge whenever possible.
机译：Coccolithophores是重要的颗粒无机碳（PIC）生产商。他们的绽放可以从卫星被检测到高背散射区域（Holligan等，1983; Balch等，1991）。 “大石思带”（Balch等人，2011）是澳大利亚夏季的高反射率的区域，在30°和60°S之间，与高浓度的Emiliania Huxleyi有关。我们计算了E. Huxleyi在南海中的纬度横断面的横向横断面的贡献，这些横向横向横跨南极环块电流（ACC）的不同前线。 CoccoSphere / Coccolith浓度低于130x10〜3 / 6x10〜6 L〜（-1）（Malinverno等，提交），代表非绽放到外绽放条件。 Speciesesspecific Coccolith PIC是从水样中SEM图像上的自由COCCOLITS的形态分析获得（Young＆Ziveri，2000）的体积计算。卫星衍生的照片估计来自Modis和SeaWIFS传感器的八个复合材料。我们的结果表明：LA）E. Huxleyi Morothepes A和C显示沿LTRanscect的尺寸和钙化程度的小纬度变化。 Coccolith在表面水域的贡献LIS主要由主要的Mor晶型控制。 LB）原位和卫星衍生的图片在45-62°S的区域中显示出良好的一致性，该区域以中间体Coccolthophore浓度为特征，并且来自其他生物颗粒的贡献。 LC）卫星衍生的PIC向南LOF的强峰值62.5°S与Coccolthophore绽放无关。反向散射源中的LSHIFT对应于南部ACC FRONT的LLL位置，其将洛卡金属主导的水与南部的北北部分离到南部。虽然蛋白石颗粒具有比方解石（Balch＆Utgof，L2009）的Lmuch较低的折射率，但是硅藻土，刚性突发物的丰富片段和Lsilicoflageles可以产生类似的高反射率Lsignal。 LSatellite产品是估计Lglobal Pic的宝贵工具，但只要尽可能与现场LS采样和生态知识相结合。

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