南海岛礁周边海域表面叶绿素浓度的时空特征

doi:10.11978/2018135

Abstract

Abstract:

There are many islands and reefs associated with abundant fishery resources in the South China Sea (SCS). Ecological variables such as chlorophyll in these regions were seldom studied. In this paper, merged ocean color data in recent ~20 years are used to analyze the spatial, seasonal and interannual variations of sea surface chlorophyll concentration (CHL) around 38 islands and reefs in the SCS. The results show that CHL is relatively high around these islands and reefs, which is generally reduced to the background level at five equivalent radii from the island center. The CHL anomaly (relative to the background CHL) is consistent with background CHL in terms of spatial distribution. They are relatively high in Xisha and Dongsha regions, and relatively low in Zhongsha and Nansha regions, mainly due to differences in temperatures and monsoon intensities. The CHL has significant seasonal and interannual variations. It rises during the winter monsoon and falls to a minimum before the summer monsoon onset. It declines in the following years of El Ni?o, when the SST increases and the monsoon weaken; and the opposite happens in the following years of La Ni?a. Moreover, the CHL anomaly increases in spring and autumn seasons when the coral reef community is growing vigorously in Xisha and Dongsha regions. It decreased significantly (P=5.05×10 ^-5) during the last 20 years, probably due to the increases in sea surface temperature and its amplitude. These findings provide useful information for the development and management of fishery resources in the SCS.

Key words: islands and reefs, chlorophyll, South China Sea, monsoons, sea surface temperature

CHEN Wuyang, LI Junmin, HE Qingyou, TANG Shilin, SHI Ping. Spatial-temporal variation of sea surface chlorophyll around islands and reefs in the South China Sea[J].Journal of Tropical Oceanography, 2019, 38(6): 21-28.

Figures/Tables 10

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海区	岛礁	经度	纬度	R/km
东沙群岛	北卫滩	115°58′E	21°04′N	2.1
	南卫滩	115°55′E	20°58′N	2.3
	东沙环礁	116°49′E	20°40′N	11.6
西沙群岛	华光礁	111°40′E	16°13′N	12.9
	中建岛	111°12′E	15°46′N	2.1
	永兴岛	112°20′E	16°50′N	2.3
	银砾滩	112°14′E	16°46′N	2.2
	玉琢礁	112°01′E	16°20′N	7.3
	浪花礁	112°31′E	16°03′N	8.2
	东岛	112°44′E	16°40′N	2.0
	金银岛	111°31′E	16°27′N	2.9
中沙群岛	华夏暗沙	113°58′E	15°52′N	3.2
	排洪滩	113°42′E	15°37′N	2.4
	中南暗沙	115°24′E	13°57′N	3.3
	黄岩岛	117°46′E	15°09′N	8.2
南沙群岛	雄南礁	116°46′E	11°55′N	2.1
	双子礁	114°21′E	11°25′N	5.9
	铁峙礁	114°14′E	11°03′N	5.4
	渚碧礁	114°05′E	10°55′N	2.8
	库归礁	114°35′E	10°45′N	4.3
	杨信沙洲	114°32′E	10°42′N	6.0
	舶兰礁	114°35′E	10°24′N	4.7
	安达礁	114°42′E	10°21′N	5.6
	牛轭礁	114°39′E	09°59′N	3.6
	主权礁	114°34′E	09°58′N	2.3
	华礁	114°18′E	09°50′N	4.2
	屈原礁	114°22′E	09°47′N	5.6
	和平暗沙	115°54′E	10°53′N	4.2
	海马滩	117°47′E	10°50′N	7.0
	东华礁	116°55′E	10°32′N	2.1
	莪兰暗沙	117°16′E	10°19′N	4.2
	半路礁	116°08′E	10°07′N	2.0
	美济礁	115°32′E	09°54′N	4.6
	仁爱礁	115°52′E	09°44′N	3.3
	浪口礁	114°40′E	08°07′N	16.1
	金盾暗沙	111°32′E	07°35′N	4.3
	福禄寺礁	113°38′E	10°14′N	2.2
	万安滩	109°31′E	07°30′N	5.3

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Spatial-temporal variation of sea surface chlorophyll around islands and reefs in the South China Sea

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