第十七次国际Argo指导组会议中国国家报告
1 实施情况
(1)浮标布放及其性能
2015年3月至2016年2月,中国共在太平洋和印度洋布放了16个浮标,这些浮标来自于中国3个机构的4位PI,其中5个铱卫星浮标来自于国家海洋局第二海洋研究所陈大可研究员、4个APEX型浮标来自于许建平研究员、6个HM2000型浮标来自于中科院海洋研究所袁东亮研究员,另外海军航保部去年也布放了1个PROVOR型浮标。相比2014年,由于相关研究项目支持经费的减少,今年布放浮标的数量明显降低了。截止2016年1月,中国共在太平洋和印度洋上布放了353个Argo浮标(包括183个准Argo浮标),目前在海上正常工作的浮标还有170个(图1)。
图1 停止工作的浮标布放位置(黑点)及正常工作的浮标最新位置(红点)
2015年9月,中科院海洋研究所在太平洋西边界流海域布放了6个HM2000型浮标,这是中国首次以准Argo浮标的形式布放国产剖面浮标。该类型浮标采用北斗卫星进行数据传输,定位方式可采用北斗定位系统或GPS定位系统。其中1个浮标在布放后没有发送回任何数据,另外一个浮标由于CTD传感器故障传回了错误的盐度数据。浮标双向通讯功能通过测试后表现正常。截止2016年1月,还有2个HM2000型浮标在正常工作,停止工作的浮标平均完成了72条剖面。
(2)对国际Argo计划的贡献
2015年10月14-25日,应北太平洋科学组织(PICES)邀请,以及国际Argo计划办公室的委托,刘增宏副研究员以国际Argo代表和第24次PICES年会观察员的身份,出席了在青岛举办的该组织第24届年会,并在MONITOR、POC、IPCC AR5等3个分委会会议上,以“全球Argo实施进展"和“全球Argo与浮标技术发展"等议题做了特邀报告,还通过墙报的形式展示了国际Argo计划实施以来所取得的重要成果。
2016年1月27日,《自然气候变化》在线发布了18个国家的27位科学家合著的综述性文章—“全球Argo海洋观测十五年"。中国相关媒体也对这一成果进行了集中报道,扩大了全球Argo计划在中国的影响,并引起了政府部门的高度重视。
(3)遇到和解决的技术问题
2015年,由于出现了显著的电导率传感器漂移,4个浮标(2个PROVOR型浮标,1个APEX型浮标,1个HM2000型浮标)被加入到了灰名单列表中,具体原因还在进一步分析中。
(4)Argo数据管理现状
AST-16会议以来,有214个浮标从海上发回数据,共有7057条温盐剖面和1000条溶解氧剖面上传至GDAC上。虽然CLS目前仍在帮助我们将Argo浮标的剖面资料上传GTS,但从2015年10月,在日本同行的帮助下,中国Argo实时资料中心已经通过中国国家气象局将Argo剖面资料上传至GTS,并打算在AST-17会议之后,停止通过CLS上传数据。对于CLS多年来的帮助深表感谢。
中国Argo实时资料中心已将数据解码和实时质量控制等相关程序改变为Matlab语言。因使用了格式化表格,使得解码器的运行更加稳定了。我们已经将大部分的元文件和技术文件转换为了3.1版文件格式,但轨迹文件还未完成转换。另外,我们将生物Argo浮标提供的生物地球化学剖面和温盐剖面进行了分离。中国Argo实时资料中心已经建立了一套北斗浮标数据接收系统,可以接收并解码来自HM2000型浮标的观测资料。由于这些浮标的PI只同意每10天共享1条剖面,所有浮标的观测资料选择性的上传GDAC。
(5)延时质量控制现状
2015年,中国Argo实时资料中心由于人力有限,没有上传经延时质量控制的资料,目前正在恢复延时资料的上传工作,以及旧文件格式向3.1版文件格式的转换工作。需要指出的是,由于准Argo浮标的数量占了总浮标数量的一半左右,从而增加了延时质量控制工作的难度。
2 国家对Argo的资助和未来前景
中国Argo计划至今还没有纳入到国家的业务化工作中,布放浮标的数量严重依赖于相关的研究项目。中国Argo计划主要依赖于国家科学技术部的资助,在中国Argo实时资料中心,有5名科研人员承担Argo浮标的布放、数据处理以及应用研究等工作。
3 浮标布放计划
2016年计划布放15个Argo浮标,其中包括4个HM2000型浮标。但准Argo浮标的布放计划一直无法统计,主要取决于相关PI对Argo计划的关注程度。
4 Argo资料的应用
Argo资料已成为研究从海盆尺度到全球尺度海洋变化的重要数据来源,同样也是业务化海洋大气同化系统和再分析数据集的重要数据来源。中国Argo实时资料中心每年更新一次Argo网格化数据产品(简称为BOA_Argo),该产品与Levitus、Tao和其他机构(例如Scripps、IPRC和JAMSTEC)制作的网格化数据产品进行了对比,2015年在原来的基础上根据一种混合层模型增添了SST、SSS和混合层深度3个变量。中国科技人员已经开始在他们的研究中使用该产品。
目前中国有两个机构分别运行着两个Argo网站,分别是位于天津国家海洋信息中心的中国Argo资料中心(www.argo.gov.cn)和位于杭州国家海洋局第二海洋研究所的中国Argo实时资料中心(www.argo.org.cn)。在两个网站上均可获得中国Argo计划的实施进展情况,剖面、轨迹等资料以及数据产品也可在网站上获取。另外,中国Argo实时资料中心还基于Hadoop技术开发了一套Argo数据查询系统,亦可通过其网站使用。
5 Argo文献参考目录(2015年)
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