2022-2023 USAP Field Season
Project Detail Project TitleHigh resolution underway air-sea observations in Drake Passage for climate science Summary
Event Number:
Program Manager:
ASC POC/Implementer: Principal Investigator(s)
Dr. Teresa Chereskin
Location
Supporting Stations: ARSV Laurence M. Gould DescriptionOn frequent crossings of the Drake Passage on the ARSV Laurence M. Gould (LMG), a range of underway measurements are taken. These data represent one of the few repeat year-round shipboard measurements in the Southern Ocean. With more than two decades of data now available, the primary science objectives of this proposal are to continue to analyze this Drake Passage time series. Some of the analyses are: (1) Describe and relate the seasonal and long-term ocean energy distribution to wind, buoyancy and topographic forcing and sinks, and (2) Describe and relate seasonal and long-term changes in the Antarctic Circumpolar Current (ACC) fronts, water masses and upwelling to biogeochemical and climate variability. High-resolution, near-repeat Expendable Bathythermograph (XBT) and Acoustic Doppler Current Profiler (ADCP) transect sampling in Drake Passage is thus used to study modes of variability in ocean temperature, salinity, currents and backscatter in the ACC on seasonal to interannual time frames, and on space scales from current cores to eddies. This project is a continuation of the longstanding support for collecting the ADCP and other underway data on United States Antarctic Program vessels, such as the LMG.
Field Season OverviewO-317-L will collect ocean current and acoustic backscatter measurements from hull-mounted shipboard acoustic Doppler profilers (ADCPs) onboard the LMG. Data will be collected on all cruises with support from the shipboard electronic technicians (ETs). The operational support from LMG ETs will be similar to that required during previous years of the project. Logistical support from the ETs consists of starting/stopping data acquisition, monitoring and archiving data at sea. During cruises ET or IT support may be required, as time allows, in the event that system maintenance or software changes need to be made while underway. Daily email transmission will be sent from the ADCP computer to allow for shore monitoring of data quality. Data will be copied to USB drives and sent to the principal investigator.
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