东海颗粒有机碳通量的模式计算

IOCAS-IR > 海洋环流与波动重点实验室

	东海颗粒有机碳通量的模式计算
	孙治涛
学位类型	博士
	2001
学位授予单位	中国科学院海洋研究所
学位授予地点	中国科学院海洋研究所
学位专业	海洋化学
关键词	颗粒有机碳东海再悬浮比表观垂直通量净垂直通量模式计算
摘要	本研究论文属于国家科学基金重点研究项目“东海关键海洋通量过程的研究”计划的一个组成部分，通过1998年夏季东海航次，测定了颗粒有机碳的(Particulate Organic Carbon)含量，并研究了东海夏季POC含量的分布特点以及影响因素。同时，通过模式计算了部分站位的POC的垂直表观通量。然后，根据海水悬浮物质、底质物和浮游生物中的DOC的含量，定量的研究了东海的再悬浮现象，计算得到32°N断面和PN断面部分站位的再悬浮比，并计算得到了这些站位的POC净垂直通量，使我们对东海的POC净沉积通量有了一个定量的认识和把握。通过研究，我们发现东海夏季的POC的分布特点是：（1）近岸区域有明显的高值区的存在，并随离岸距离的增加而降低，这主要是受长江径流的影响；（2）在以(32°N, 125°E-125.5°E)为中心的冷涡表层海域存在着另一个POC含量的高值区，随深度增加而降低，在25米层以下随深度的增加而增加，在近底层形成一个新的高值区，研究表明表层高值区主要受生物生长的控制，而底层的高值区的存在与该区域的涡动层或上升流的存在有一定的关系；（3）同时，在东海所研究的两个断面，TSM（Total Suspended Materials）和POC的含量之间表现出了较好的相关性。通过模式研究，计算了六个站位八个层次的POC的垂直通量，其垂直通量为12.43 mg·m~(-2)·d~(-1)-148.23 mg·m~(-2)·d~(-1)，最大值为148.23 mg·m~(-2)·d~(-1)，出现在107站(32°N, 125°E)10米层，最小值为12.43 mg·m~(-2)·d~(-1)，出现在111站(32°0.08N, 125°59.57'E)的底层。通过对东海再悬浮比率的定量研究，计算了五个站和个层次的再悬浮比率。结果表明：（1）表层海水中悬浮物质的再悬浮比率在47.4%-79.18%之间；底层的再悬浮比率在72.75%-96.96%之间；（2）再悬浮比率的最大值出现在106站(32°N, 124°30'E)的底层，而再悬浮比率的最小值出现在102站(32°N, 122°30'E)的表层。在POC重直通量和再悬浮模式计算的基础上，我们计算得到了六个站位八个层次的POC净垂直通量，颗粒有机碳的净垂直通量最大值出现在107站(32°N, 125°E)的10米层，为117.4 mg·m~(-2)·day~(-1)；最小值出现在111站(32°0.08'N, 125°59.57'E)的底层为0.79 mg·m~(-2)·day~(-1)。通过几个站位的模式计算估算了东海颗粒有机碳平均的净沉积通量，其大约为6.55 mgC·m~(-2)·day~(-1)，即2.39gC·m~(-2)·y~(-1)。从而使我们对东海的颗粒有机碳的净垂直通量有了一个定量的认识。
其他摘要	The research of this paper is a part of "Study on the Key Process of Ocean Flux in the East China Sea" supported by National Science Fund Committee. The contents of POC(Particulate Organic Carbon) are determined and the distribution characteristics of POC and the factors affecting the distribution are studied through the cruise of East China Sea in July, 1998. The apparent flux of POC was calculated through the modeling calculation. Based on the data of POC contents in the suspended matter, phytoplankton and surface sediments at some stations of Section 1 and Section PN, the resuspension ratios and net fluxes of POC of these stations are studied. Therefore, a quantitative understanding of the net vertical flux of POC is obtained in the East China Sea. The characteristics of POC distribution in the East China Sea showed that: (1) there is an obvious area of high POC content, and the decrease of POC content along with the increase of distance from the shore indicates the influence of runoff of Changjiang River; (2) there is also a high POC area centered in (32°N, 125°E-125.5°E) surface layer and the concentration decreases along with depth and form another high POC area at the bottom. We think that the surface high POC area was controlled by the production of phytoplankton and the bottom high POC area was induced by the up-welling near this area; (3) the contents of POC shows a good positive correlation with the content of TSM at stations of Section 1 and Section PN. The apparent vertical fluxes were obtained at six stations by modeling calculation, and the fluxes range from 12.43mg·m~(-2)·d~(-1) to 148.23 mg·m~(-2)·d~(-1). The maximum of POC is at the layer of 10m of Station 107(32°N, 125°E); and the minimum is at the bottom layer of Station 111(32°0.08'N, 125°59.57'E). The resuspension ratios of five stations are obtained through the quantitative modeling calculation in the East China Sea and the results showed that: (1) the resuspension ratios of surface layers range from 47.4% to 79.18%, and the resuspension ratios of bottom layers range from 72.75% to 96.96%; (2) the maximum the resuspension ratios was at the bottom layer of Station 106 (32°N, 124°30'E), and the minimum was at the surface layer of Station 102(32°N, 122°30'E). Based on the data of apparent vertical flux of POC and resuspension ratios at some stations, the net vertical flux of POC at six stations was calculated. The results showed that the maximum of net vertical flux of POC with 117.4 mgC·m~(-2)·day~(-1) was at the layer of 10m of Station 107(32°N, 125°E), the minimum of net vertical flux of POC with 0.79 mgC·m~(-2)·day~(-1) was at the bottom layer of Station 111(32°0.08'N, 125°59.57'E). Integrating the data obtained above, we estimated that the average sedimentation flux of POC was about 6.55 mgC·m~(-2)·day~(-1)(2.39gC·m~(-2)·y~(-1)).
页数	56
语种	中文
文献类型	学位论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/1233
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	孙治涛. 东海颗粒有机碳通量的模式计算[D]. 中国科学院海洋研究所. 中国科学院海洋研究所,2001.

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