GEE数据集——全球海洋数据分析项目数据集 (GLODAP) v2.2023¶-编程知识

简介

全球海洋数据分析项目 (GLODAP) v2.2023¶
全球海洋数据分析项目（GLODAP）v2.2023 在海洋生物地球化学瓶数据的综合方面取得了重大进展。此次更新以海水无机碳化学为主要重点，以 GLODAPv2.2022 为基础，纳入了几项关键改进。值得注意的是，新增了 43 个巡航航次，以扩大数据集的覆盖范围，直至 2020 年。在数据质量控制过程中，删除了温度缺失的条目。此外，每次巡航都加入了数字对象标识符（DOIs），增强了数据的可追溯性。GLODAPv2.2022 还包括一些小的修正，以提高数据的准确性。前言 – 人工智能教程

该数据集包含来自全球各大洋 1108 次航行的 140 多万份水样，涵盖 12 个基本变量，如盐度、氧气、硝酸盐、硅酸盐、磷酸盐、溶解无机碳、总碱度、pH 值、CFC-11、CFC-12、CFC-113 和 CCl4。数据有两种格式：原始数据格式（已更新为世界海洋学数据交换格式）和经过偏差最小化调整的合并数据产品。采用了严格的质量控制程序，并通过将新的巡航数据与来自 GLODAPv2.2020 的质量控制数据进行比较来进行调整。据信，该数据集可在特定范围内对每个变量进行精确测量。

若要访问这一宝贵资源及其文档（包括 DOI），请访问 NOAA NCEI 的海洋碳数据系统，网址为：。此外，还提供了合并数据产品，包括单一的全球文件以及北冰洋、大西洋、印度洋和太平洋的区域文件。这些文件包含通过插值或计算得出的辅助数据和近似数据。有关全面信息和数据访问，请访问 GLODAP 的官方网站。研究人员可根据所提供的资源和文件从这一活数据集中获益。

数据质量和准确性

数据集经过了广泛的质量控制，重点是对偏差进行系统评估。所做的调整旨在消除因测量、校准和数据处理方法相关的误差而产生的潜在偏差，同时保留评估变量中已知或可能的时间趋势或变化。

据信，经过汇编和调整的数据产品具有很高的准确性和一致的测量结果：

盐度优于 0.005 氧：1% 硝酸盐：2% 硅酸盐：2% 磷酸盐：2% 溶解无机碳：4 μmolkg-¹ 总碱度：4 μmolkg-¹ pH 值：0.01-0.02（因地区而异）卤化瞬态示踪剂：5% 汇编中的其他变量，如同位素示踪剂和离散二氧化碳逸度（fCO2），未进行偏差比较或调整。

波段信息

Variable / Parameter	Abbreviation	Unit	Observation Type	Sampling Instrument	Quality Flag Convention	Researcher Name
Temperature	temperature	°C	measured, data synthesis	CDT, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Potential temperature	theta	°C	calculated			GLODAP Group
Salinity	salinity		measured, data synthesis	CDT, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Potential density	sigma0	kg m−3	calculated			GLODAP Group
Potential density, ref 1000 dbar	sigma1	kg m−3	calculated			GLODAP Group
Potential density, ref 2000 dbar	sigma2	kg m−3	calculated			GLODAP Group
Potential density, ref 3000 dbar	sigma3	kg m−3	calculated			GLODAP Group
Potential density, ref 4000 dbar	sigma4	kg m−3	calculated			GLODAP Group
Neutral density	gamma	kg m−3	calculated			GLODAP Group
Oxygen	oxygen	μmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Apparent oxygen utilization	aou	μmol kg−1	calculated			GLODAP Group
Nitrate	nitrate	μmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Nitrite	nitrite	μmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Silicate	silicate	μmol kg−1	measured, data synthesis	CDT, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Phosphate	phosphate	μmol kg−1	measured, data synthesis	CDT, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
TCO2	tco2	μmol kg−1	measured, calculated, data synthesis	CTD, Niskin Bottles	Simplified WOCE quality control flags are used	GLODAP Group
TAlk	talk	μmol kg−1	measured, calculated, data synthesis	CTD, Niskin Bottles	Simplified WOCE quality control flags are used	GLODAP Group
fCO2	fco2	microatmospheres	measured, calculated, data synthesis	CTD, Niskin Bottles	Simplified WOCE quality control flags are used	GLODAP Group
pH at total scale, 25 °C and zero dbar of pressure	phts25p0		measured, calculated, data synthesis	CTD, Niskin Bottles	Simplified WOCE quality control flags are used	GLODAP Group
pH at total scale, in situ temperature and pressure	phtsinsitutp		measured, calculated, data synthesis	CTD, Niskin Bottles	Simplified WOCE quality control flags are used	GLODAP Group
CFC-11	cfc11	pmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
pCFC-11	pcfc11	ppt	measured, data synthesis	CTD, Niskin Bottles		GLODAP Group
CFC-12	cfc12	pmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
pCFC-12	pcfc12	ppt	measured, data synthesis	CTD, Niskin Bottles		GLODAP Group
CFC-113	cfc113	pmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
CCl4	ccl4	pmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
pCCl4	pccl4	ppt	calculated			GLODAP Group
SF6	sf6	fmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
pSF6	psf6	ppt	calculated			GLODAP Group
δ13C	c13	%	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
∆14C	c14	%	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
∆14C counting error	c14err	%	calculated			GLODAP Group
3H	h3	TU	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
3H counting error	h3err	TU	calculated			GLODAP Group
δ3He	δ3He	%	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
3He counting error	he3err	%	calculated			GLODAP Group
He	He	nmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
He counting error	heerr	%	calculated			GLODAP Group
Neon	neon	nmol kg−1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Neon counting error	neonerr	nmol kg−1	calculated			GLODAP Group
δ18O	o18	%	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Total organic carbon	toc	μmol L-1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Dissolved organic carbon	doc	μmol L-1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Dissolved organic nitrogen	don	μmol L-1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Total dissolved nitrogen	tdn	μmol L-1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group
Chlorophyll a	chla	ug L-1	measured, data synthesis	CTD, Niskin Bottles	WOCE quality control flags are used	GLODAP Group

引用Citation¶

Whenever GLODAPv2 is used, the following citations must be included:

For data and data product: Olsen et al., 2016 and Key et al., 2015
For mapped product: Lauvset et al., 2016 and Key et al., 2015

Olsen, A., R. M. Key, S. van Heuven, S. K. Lauvset, A. Velo, X. Lin, C. Schirnick, A. Kozyr, T. Tanhua, M. Hoppema, S. Jutterström, R. Steinfeldt,
E. Jeansson, M. Ishii, F. F. Pérez and T. Suzuki. The Global Ocean Data Analysis Project version 2 (GLODAPv2) – an internally consistent data
product for the world ocean, Earth Syst. Sci. Data, 8, 297–323, 2016, doi:10.5194/essd-8-297-2016Lauvset, S. K, R. M. Key, A. Olsen, S. van Heuven, A. Velo, X. Lin, C. Schirnick, A. Kozyr, T. Tanhua, M. Hoppema, S. Jutterström, R. Steinfeldt, E.
Jeansson, M. Ishii, F. F. Pérez, T. Suzuki and S. Watelet. A new global interior ocean mapped climatology: the 1°x1° GLODAP version 2, Earth Syst.
Sci. Data, 8, 325–340, 2016, doi:10.5194/essd-8-325-2016Key, R.M., A. Olsen, S. van Heuven, S. K. Lauvset, A. Velo, X. Lin, C. Schirnick, A. Kozyr, T. Tanhua, M. Hoppema, S. Jutterström, R. Steinfeldt, E.
Jeansson, M. Ishii, F. F. Perez, and T. Suzuki. 2015. Global Ocean Data Analysis Project, Version 2 (GLODAPv2), ORNL/CDIAC-162, NDP-093. Carbon
Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee. doi:10.3334/CDIAC/OTG.
NDP093_GLODAPv2

数据预处理

matlab 派生产品会在所有列名前添加一个 G2，并保持原样，但会添加名为 system:time_start 和 datetime 的额外列，以反映从现有列导出的纪元时间和 UTC 日期。添加 system:time_start 和 datetime 后，就可以在地球引擎集合中轻松进行筛选。在提供合并集合的同时，仍保留了单个地物集合，以便用户灵活加载较小的地物子集进行操作。

代码

var merged = ee.FeatureCollection("projects/sat-io/open-datasets/GLODAP_V2/GLODAPv2_2023_Merged_Master_File_formatted");
var arctic_ocean = ee.FeatureCollection("projects/sat-io/open-datasets/GLODAP_V2/GLODAPv2_2023_Arctic_Ocean_formatted");
var atlantic_ocean = ee.FeatureCollection("projects/sat-io/open-datasets/GLODAP_V2/GLODAPv2_2023_Atlantic_Ocean_formatted");
var indian_ocean = ee.FeatureCollection("projects/sat-io/open-datasets/GLODAP_V2/GLODAPv2_2023_Indian_Ocean_formatted");
var pacific_ocean = ee.FeatureCollection("projects/sat-io/open-datasets/GLODAP_V2/GLODAPv2_2023_Pacific_Ocean_formatted");