Physical and chemical surface observations in the South Indian Ocean from two uncrewed sailing vehicles
Description
This dataset collects a record of physical and chemical observations made by two uncrewed sailing vehicles (Saildrone 1038 and Saildrone 1039) in the South Indian Ocean during 2022 and 2023. SD1038 collected data near 15°E and between latitudes 35°S and 50°S during July 19-26, 2022. SD1039 made observations within the Subantarctic Zone (37-47°S, 20-45°E) between September 1, 2022 until February 24, 2023. The local atmospheric and surface ocean parameters measured are listed below: -- Atmospheric measurements: temperature, pressure, humidity. -- Seawater measurements: temperature, pressure, conductivity, salinity. -- Carbon measurements: fCO2, xCO2, and pCO2 in atmosphere and seawater. -- Chlorophyll measurements: concentration. -- Oxygen measurements: concentration, saturation, ratio of O2 in water to air. -- Wind measurements: eastward, northward, and downward speed, plus gusts and direction. -- Wave measurements: significant wave height and dominant wave period. -- Irradiation measurements (SD1039 only): longwave, shortwave, and PAR. -- Current velocity measurements (SD1039 only): eastwards, northwards, and upwards, down to 102m. -- CCMP wind estimates (hourly only): collocated to Saildrone time and location. -- Directions of large eddies transitted (SD1039 hourly only): based on AVISO eddy database. Four files included: -- SD1038_1min.nc (SD1038’s raw data at 1-minute timesteps with frequent gaps) -- SD1039_1min.nc (SD1039’s raw data at 1-minute timesteps with frequent gaps) -- SD1038_hrly.nc (SD1038’s hourly-averaged data, plus eddies and CCMP winds) -- SD1039_hrly.nc (SD1039’s hourly-averaged data, plus eddies and CCMP winds) 1-minute files contain the “raw” data, at all times it was collected. Because many variables were only sampled once or a few times an hour, these files include frequent gaps. Hourly files were made from the 1-minute data, averaging whatever data exists within each hour, such that few gaps in the data exist for most variables.
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Steps to reproduce
The majority of the variables are direct in-situ sampled data from the two surface vehicles. The 1-minute files are raw in-situ data collected by the two Saildrones. The hourly files contain the hourly-averaged form of that data. The pCO2 terms were calculated from other sampled data by collaborators Sutton et al at NOAA Pacific Marine Environmental Laboratory. See also: https://doi.org/10.25921/r2mt-t398 (for SD1038) and https://doi.org/10.25921/6b0k-r665 (for SD1039). Cross-Calibrated Multi-Platform (CCMP) winds are from Remote Sensing System’s version 2.1 near-real-time data, which can be downloaded from https://data.remss.com/ccmp/v02.1.NRT. Eddy rotation directions were based on the near-real-time Mesoscale Eddy Trajectory Atlas, produced by SSALTO/DUACS and distributed by the AVISO+ with support from CNES and IMEDEA (https://www.aviso.altimetry.fr/en/data/products/value-added-products/global-mesoscale-eddy-trajectory-product/meta3-2-exp-nrt.html).
Institutions
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Funding
U.S. National Science Foundation
2048840