Warm Core Ring Trajectories in the Northwest Atlantic Slope Sea (2011-2020)

This dataset contains weekly trajectory information of Gulf Stream Warm Core Rings from 2011-2020. This dataset is comprised of individual files containing each ring’s weekly center location and its area for 282 WCRs present between January 1, 2011 and December 31, 2020. Each Warm Core Ring and is identified by a unique alphanumeric code 'WEyyyymmddA', where 'WE' represents a Warm Eddy (as identified in the analysis charts); 'yyyymmdd' is the year, month and day of formation; and the last character 'A' represents the sequential sighting of the eddies in a particular year. Continuity of a ring which passes from one year to the next is maintained by the same character in the first sighting. For example, the first ring in 2017 having a trailing alphabet of 'E' indicates that four rings were carried over from 2016 which were still observed on January 1, 2017. Each ring has its own netCDF (.nc) filename following its alphanumeric code. Each file contains 4 variables, “Lon”- the ring center’s weekly longitude, “Lat”- the ring center’s weekly latitude, “Area” - the rings weekly size in km2, and “Date” in days - representing the week since Jan 01, 0000. The process of creating the WCR tracking dataset follows the same methodology of the previously generated WCR census (Gangopadhyay et al., 2019, 2020). The Jenifer Clark’s Gulf Stream Charts used to create this dataset are 2-3 times a week from 2011-2020. Thus, we used approximately 1560 Charts for the 10 years of analysis. All of these charts were reanalyzed between 75° and 55°W using QGIS 2.18.16 (2016) and geo-referenced on a WGS84 coordinate system (Decker, 1986). Gangopadhyay, A., G. Gawarkiewicz, N. Etige, M. Monim and J. Clark, 2019. An Observed Regime Shift in the Formation of Warm Core Rings from the Gulf Stream, Nature - Scientific Reports, https://doi.org/10.1038/s41598-019-48661-9. www.nature.com/articles/s41598-019-48661-9. Gangopadhyay, A., N. Etige, G. Gawarkiewicz, A. M. Silver, M. Monim and J. Clark, 2020. A Census of the Warm Core Rings of the Gulf Stream (1980-2017). Journal of Geophysical Research, Oceans, 125, e2019JC016033. https://doi.org/10.1029/2019JC016033. QGIS Development Team. QGIS Geographic Information System (2016). Decker, B. L. World Geodetic System 1984. World geodetic system 1984 (1986).

本数据集收录了2011-2020年墨西哥湾暖流暖核环（Gulf Stream Warm Core Rings, WCRs）的周度轨迹信息。本数据集由多个独立文件组成，涵盖2011年1月1日至2020年12月31日间出现的282个暖核环的每周中心位置与面积数据。每个暖核环均配有唯一的字母数字编码"WEyyyymmddA"：其中"WE"代表暖涡（Warm Eddy），即分析图表中识别出的暖涡；"yyyymmdd"为暖涡生成的年、月、日；末尾字符"A"代表该年度内暖涡的连续观测序号。跨年度存续的暖环将沿用首次出现时的编码字符，以保持轨迹连续性。例如，2017年首个后缀为"E"的暖环，表明有4个2016年生成的暖环在2017年1月1日仍处于观测范围内。每个暖核环均以其字母数字编码作为netCDF（.nc）格式文件名。每个文件包含4个变量："Lon"为暖环中心的周度经度，"Lat"为暖环中心的周度纬度，"Area"为暖环的周度面积（单位：平方千米），以及以天数计量的"Date"，代表自公元0年1月1日起的累计周数。
本暖核环追踪数据集的构建方法，与此前发布的暖核环普查数据集（Gangopadhyay等，2019、2020）采用了相同的研究范式。本数据集所依托的珍妮弗·克拉克墨西哥湾暖流海图（Jenifer Clark’s Gulf Stream Charts）在2011-2020年间每周发布2-3次，因此本次10年分析共使用约1560张海图。所有海图均在西经75°至55°范围内通过QGIS 2.18.16（2016）进行了重新分析，并在WGS84坐标系（世界大地测量系统1984，Decker, 1986）下完成地理配准。
参考文献：
1. Gangopadhyay, A., G. Gawarkiewicz, N. Etige, M. Monim and J. Clark, 2019. 墨西哥湾暖流暖核环生成过程中的观测态移，《自然》子刊《科学报告》，https://doi.org/10.1038/s41598-019-48661-9. www.nature.com/articles/s41598-019-48661-9.
2. Gangopadhyay, A., N. Etige, G. Gawarkiewicz, A. M. Silver, M. Monim and J. Clark, 2020. 1980-2017年墨西哥湾暖流暖核环普查，《地球物理研究杂志：海洋》，125, e2019JC016033. https://doi.org/10.1029/2019JC016033.
3. QGIS开发团队. QGIS地理信息系统(2016).
4. Decker, B. L. 世界大地测量系统1984(1986).