CAJ | 학술논문

在长江口附近和浙江近海海域,近些年来每年春季几乎都发生大规模的东海原甲藻(Prorocentrum donghaiense)赤潮,时间通常是在4月底或5月初,但2005年却一直到5月底才发生.本文根据近几年在浙江近海进行的多个春季航次的调查资料和有关站位的气象资料,分析了该海区2005年春初的温度特征及其对大规模东海原甲藻赤潮发生的影响,阐明了2005年春季大规模东海原甲藻赤潮迟发的主要物理环境原因.结果表明,2005年3月浙江近海水温比多年同期平均值偏低,且这种情况在近岸区更为明显;与2004年同期相比,2005年春初(4月初)浙江近海水温偏低,2005年和2004年的这种水温差异在近岸和中上层的低盐水里最为明显,而在远岸和下层的高盐水水温差异则相对要小;近岸低盐水最低温度2005年比2004年低约2.6℃;2005年1-3月浙江近海特殊的气象条件(10 a中最低的气温和强劲的偏北大风)和2004/2005年冬季较弱的台湾暖流是形成4月初浙江近海低温特征的主要原因;2004年冬季和2005年春初浙江近水温偏低很可能是2005年春季东海大规模原甲藻赤潮迟发的主要原因.
재장강구부근화절강근해해역,근사년래매년춘계궤호도발생대규모적동해원갑조(Prorocentrum donghaiense)적조,시간통상시재4월저혹5월초,단2005년각일직도5월저재발생.본문근거근궤년재절강근해진행적다개춘계항차적조사자료화유관참위적기상자료,분석료해해구2005년춘초적온도특정급기대대규모동해원갑조적조발생적영향,천명료2005년춘계대규모동해원갑조적조지발적주요물리배경원인.결과표명,2005년3월절강근해수온비다년동기평균치편저,차저충정황재근안구경위명현;여2004년동기상비,2005년춘초(4월초)절강근해수온편저,2005년화2004년적저충수온차이재근안화중상층적저염수리최위명현,이재원안화하층적고염수수온차이칙상대요소;근안저염수최저온도2005년비2004년저약2.6℃;2005년1-3월절강근해특수적기상조건(10 a중최저적기온화강경적편북대풍)화2004/2005년동계교약적태만난류시형성4월초절강근해저온특정적주요원인;2004년동계화2005년춘초절강근수온편저흔가능시2005년춘계동해대규모원갑조적조지발적주요원인.
In spring of recent years, a large scale harmful algae bloom (HAB) of Prorocentrum donghaiense nearly occurs annually in the end of April or beginning of May in the Zhejiang coastal and off Changjiang estuary region, however, it did't occur until the end of May of 2005. Temperature characteristic in the study area in early spring of 2005 and its influence on a large scale HAB of Prorocentrum donghaiense are analyzed on the basis of survey data carried out in spring of 2002 - 2005 and some related historical meteorologic data. The results show that water temperature in March 2005 is obviously lower than that of 15-year -averaged(1985 -2001) in Zhejiang coastal sea, especially in nearshore region of Zhejiang coastal sea,compared to the same period of 2004, water temperature in early spring(early April) 2005 is about 2. 6 ℃ lower. Special meteorologic conditions (the lowest air temperature in the past ten years and strong northern monsoon)and feeblish Taiwan Warm Current in winter of 2004/2005 are the main causes of low water temperature in investigated area. Low temperature characteristic may be main causative factor that a HAB of Prorocentrum donghaiense in spring 2005 occurred late which differ from that of Spring 2002-2004 in Zhejiang coastal sea.