Bulk density of level sea ice during the MOSAiC freezing season (October 2019 to April 2020), derived from both point observations or regional integration.

MOSAiC: the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition.

Assuming hydrostatic equilibrium, the regional bulk density of level sea ice over tens of kilometers was determined using a combination of data from ice mass balance buoys, snow pits, Airborne Laser Scanning (ALS), and the Ice, Cloud, and land Elevation Satellite-2 (ICESat-2), at both the Distributed Network (DN) and L-site scales, with a radius of 50 and 25 km from the research vessel Polarstern, respectively. Bulk density measurements derived from the MOSAiC Main Coring Sites (MCS) using the weighing method are also provided. 

Variable Details:

[Time]: covering the period from 5 October 2019 to 30 April 2020 in the format yyyyMMdd.

[Daily Drift Location]: contains the latitude and longitude characterizing the daily position for the MOSAiC Central Observatory (CO).

[IBD_DN (kg m−3)]: Estimated mean sea ice bulk density within a radius of ~50 km from CO (DN scale, buoy sites).

[IBD_DN_Unc (kg m−3)]: Uncertainty of the DN scale sea ice bulk density results based on the Gaussian error propagation method.

[IBD_Lsite (kg m−3)]: Estimated mean sea ice bulk density within a radius of ~25 km from CO (L-site scale, buoy sites).

[IBD_Lsite_Unc (kg m−3)]: Uncertainty of the L-site scale sea ice bulk density results based on the Gaussian error propagation method. 

[IBD_DN & Lsite (kg m−3)]: Mean value of IBD_DN and IBD_Lsite.

[IBD_DN & Lsite_sm (kg m−3)]:  Linear interpolation and biweekly moving average of IBD_DN & Lsite.

[IBD_Regional_ modeled (kg m−3)]:  Hydrostatic equilibrium-based modeled IBD estimates during the MOSAiC freezing season.

[IBD_MCS_FYI (kg m−3)]: Core-based bulk density derived from the main first-year coring sites (MCS-FYI) during MOSAiC.

[IBD_MCS_FYI_Std (kg m−3)]: Standard deviation of MCS-FYI bulk density estimates。

[IBD_MCS_SYI (kg m−3)]: Core-based bulk density derived from the main second-year coring sites (MCS-SYI) during MOSAiC.

[IBD_MCS_SYI_Std (kg m−3)]: Standard deviation of MCS-SYI bulk density estimates。