Mark Wensnahan

Selected Projects

  • Evaluation of Reanalysis Products in the Arctic

    Seasonal Anomaly Maps — each product compred to the ensemble medianSeasonal Trend Maps — seasonal trends of each variableThis work has been published in the Journal of Climate (Lindsay, R., M. Wensnahan, A. Schweiger, and J. Zhang, 2014: Evaluation of seven different atmospheric reanalysis products in the Arctic. J. Climate, DOI: 10.1175/JCLI-D-13-00014.1. )AbstractAtmospheric reanalyses depend on a mix of observations and model forecasts. In data-sparse regions such as the Arctic, the reanalysis solution is more dependent on the model structure, assumptions, and data assimilation methods than in data-rich regions. Applications such as the forcing of ice-ocean models are sensitive to…

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  • Sea Ice Thickness Estimates Obtained from Satellites Using Submarines and Other In Situ Observations

    We compare the observations of arctic sea ice thickness estimates from satellites with in situ observations – collected by submarine cruises and moorings under the sea ice, by direct measurement during field camps, by electromagnetic instruments flown over the sea ice, and by buoys drifting with the sea ice – to provide a careful assessment of our capabilities to monitor the thickness of sea ice.

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  • The Impact of Submarine Depth, Speed Sonar Systems on Arctic Sea-ice Draft Measurements

    Measurements of Arctic sea-ice thickness are critical to understanding the global climate system. One of the best sources of thickness data are upward looking sonar measurements of ice draft made by U.S. Navy submarines (draft is the submerged portion of floating sea ice, about 93% of the thickness).

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