长江口叶绿素a年际变化及其对三峡大坝的响应

于兰芳; 吴晓; 毕乃双; 刘京鹏; 王厚杰

doi:10.16028/j.1009-2722.2019.124

长江口叶绿素a年际变化及其对三峡大坝的响应

1.
中国海洋大学海洋地球科学学院，海底科学与探测技术教育部重点实验室，青岛 266100

2.
中国地质调查局青岛海洋地质研究所，青岛 266071

基金项目: 国家自然科学基金（41525021）；中国地质调查局项目（DD20160137）

详细信息

作者简介: 于兰芳（1993—），女，在读硕士，主要从事海洋地质方面的研究工作. E-mail：yulanfang@stu.ouc.edu.cn

通讯作者: 王厚杰（1972—），男，博士，教授，主要从事海洋沉积动力学方面的研究工作. E-mail：hjwang@ouc.edu.cn

中图分类号: P736.21

收稿日期: 2019-05-22

刊出日期: 2020-07-28

TEMPORAL VARIATIONS OF THE CHLOROPHYLL-a CONCENTRATION OFF THE CHANGJIANG (YANGTZE) RIVER MOUTH AND RESPONSE TO THE THREE GORGES DAM

1.
College of Marine Geosciences, Ocean University of China, Key Laboratory of Submarine Geosciences and Prospecting Technique, Ministry of Education, Qingdao 266100, China

2.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China

More Information

Corresponding author: WANG Houjie, hjwang@ouc.edu.cn

Received Date: 22 May 2019

Publish Date: 28 July 2020

摘要

摘要:
通过SeaWiFS和MODIS卫星数据获得1997—2012年长江口区域年均、月均叶绿素a浓度，结合长江入海水沙资料，研究长江口叶绿素a浓度变化与长江来水来沙的关系及对三峡建坝的响应。结果显示，研究区在年均与月均尺度上，长江口叶绿素a浓度与长江径流量均存在较好的线性关系（判定系数分别为0.72和0.89），而与输沙关系较差，说明径流携带溶解态营养盐对浮游植物的贡献大于泥沙颗粒吸附的颗粒态营养盐贡献；三峡建坝后，研究区年均叶绿素a浓度出现下降趋势，月均叶绿素a浓度变化显示，原本的春、夏季峰值出现了一个月左右的滞后期，分析主要与建坝后较多枯水年份导致的春旱和三峡防洪前的排水以及夏季对洪峰的拦截有关；虽然蓄洪排枯增加了枯水月份径流量，但由于枯水月大多温度低、透光性差，不利于浮游植物生长，蓄洪排枯对枯水月份叶绿素影响不大，洪水季由于削峰导致叶绿素浓度较大坝建成前降低，因此，三峡大坝建成后研究区总体年际叶绿素a浓度呈降低趋势。
- 长江口 /
- 叶绿素a /
- 长江入海水沙 /
- 输沙量 /
- 三峡大坝
Abstract:
Temporal variations of sea surface chlorophyll-a concentration off the Changjiang (Yangtze) River mouth were investigated using SeaWiFS and MODIS data over the period of 1997-2012. The datasets of water and sediment discharge at Datong Station were also collected in order to examine the relationship between chlorophyll-a concentration in Yangtze River estuary and the river water and sediment discharge, as well as to clarify its response to the TGD Project. The results showed that both the average annual chlorophyll-a concentration with the annual water discharge, and the average monthly chlorophyll-a concentration with the monthly water discharge showed a good linear relationship (R²=0.72; R²=0.89). But the chlorophyll-a concentration has a poorer relationship with the sediment discharge from Yangtze River, which showed that the contribution of water discharge carrying dissolved nutrients to phytoplankton is greater than the part provided by sediment. Besides, the annual chlorophyll-a concentration in the study area has a decrease tendency after the TGD, the monthly average chlorophyll-a concentration also showed a delay of the spring and summer peak. It may be related to the spring drought caused by more dry years after TGD, and the reservoir operation mechanism. Although the TGD operation mechanism increased the water discharge in the dry season, the chlorophyll-a concentration showed a decrease tendency because of the lower temperature and lower transparency caused by the strong sediment resuspension in the coastal area in winter time.
- Changjiang (Yangtze) River Mouth /
- chlorophyll-a concentration /
- sediment discharge /
- sediment discharge /
- Three Gorges Dam

HTML全文

图 1 长江流域干流主要水文站与三峡库区（A）及研究区（B）（据文献[19]修改）

Figure 1.

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图 2 实测与卫星数据获取叶绿素浓度^[20]（A）及SeaWiFS和MODIS卫星反演叶绿素a浓度^[10]（B）的对比

Figure 2.

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图 3 大通站年径流与输沙年际变化（A）、研究区1997—2012年Chl-a浓度年际变化（B）以及Chl-a浓度与径流量（C）和输沙量（D）的线性相关性

Figure 3.

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图 4 三峡建坝后大通站月均水沙变化率^[26-27]（A）和Chl-a月均浓度变化率（B）以及月均径流量（C）和月均输沙量（D）与Chl-a月均浓度的线性关系

Figure 4.

下载: 全尺寸图片幻灯片

图 5 三峡建坝前后月均叶绿素a浓度

Figure 5.

下载: 全尺寸图片幻灯片

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