A5080643859- Arctic and Antarctic ice dynamics
- Climate variability and models
- Oceanographic and Atmospheric Processes
- Meteorological Phenomena and Simulations
- Cryospheric studies and observations
- Atmospheric aerosols and clouds
- Isotope Analysis in Ecology
- Atmospheric chemistry and aerosols
- Groundwater and Isotope Geochemistry
- Methane Hydrates and Related Phenomena
- Climate change and permafrost
- Spacecraft and Cryogenic Technologies
- Tropical and Extratropical Cyclones Research
- Atmospheric and Environmental Gas Dynamics
University of East Anglia
2019-2024
Abstract The Iceland and Greenland Seas are a crucial region for the climate system, being headwaters of lower limb Atlantic Meridional Overturning Circulation. Investigating atmosphere–ocean–ice processes in this often necessitates use meteorological reanalyses—a representation atmospheric state based on assimilation observations into numerical weather prediction system. Knowing quality reanalysis products is vital their proper use. Here we evaluate surface‐layer meteorology surface...
Abstract The Iceland Greenland Seas Project (IGP) is a coordinated atmosphere–ocean research program investigating climate processes in the source region of densest waters Atlantic meridional overturning circulation. During February and March 2018, field campaign was executed over southern that utilized range observing platforms to investigate critical region, including vessel, aircraft, moorings, sea gliders, floats, meteorological buoy. A remarkable feature highly deployment platforms,...
Abstract The THINICE field campaign, based from Svalbard in August 2022, provided unique observations of summertime Arctic cyclones, their coupling with cloud cover, and interactions tropopause polar vortices sea ice conditions. was motivated by the need to advance our understanding these processes improve coupled models used forecast weather ice, as well long-term projections climate change Arctic. Two research aircraft were deployed complementary instrumentation. Safire ATR42 aircraft,...
Abstract Marine cold‐air outbreaks (CAOs) are vigorous equatorward excursions of cold air over the ocean, responsible for majority wintertime oceanic heat loss from subpolar seas North Atlantic. However, impact individual CAO events on ocean is poorly understood. Here we present first coupled observations atmosphere and during a event, between 28 February 13 March 2018, in Atlantic region. Comprehensive presented five aircraft flights, research vessel, meteorological buoy, subsurface...
Abstract In wintertime over the subpolar North Atlantic Ocean (SPNA), strongest surface sensible and latent heat fluxes typically occur just downstream of sea‐ice edge. The recent retreat in Arctic sea ice is changing distribution these turbulent fluxes, with consequences for formation dense waters that feed into Meridional Overturning Circulation. Projections flux SPNA are investigated using output from HadGEM3‐GC3.1 climate model, produced as part sixth phase Coupled Model Inter‐Comparison...
Abstract Convective coherent structures shape the atmospheric boundary layer over lifecycle of marine cold-air outbreaks (CAOs). Aircraft measurements have been used to characterize such in past CAOs. Yet, aircraft case studies are limited snapshots a few hours and do not capture how structures, associated boundary-layer characteristics, change CAO time scale, which can be on order several days. We present novel ship-based approach determine evolution coherent-structure based profiling lidar...
Melt ponds play a key role in the Arctic sea-ice surface energy budget. Their reduced albedo compared to surrounding ice and snow surfaces increases absorption of short-wave radiation enhances melt. Further, melt affect atmosphere-ice-ocean turbulent exchanges heat, moisture momentum, which influence structure overlying boundary layer.  Simulation exchange over sea coupled numerical weather prediction models depends on parameterization schemes that need further development....
Abstract The Iceland and Greenland Seas are characterized by strong heat fluxes from the ocean to atmosphere during wintertime. Here we characterize atmospheric signal of this evaporation in terms water vapor isotopes investigate if such a can have cumulative imprint on mixed‐layer. Observations include continuous isotope measurements, event‐based precipitation samples, sea‐water samples taken at various depths research vessel Alliance Iceland‐Greenland Project cruise February March 2018. In...
<p>The water cycle in atmospheric and coupled models is a major contributor to model uncertainty, particular at high-latitudes, where contrasts between ice-covered regions the open ocean fuel intense heat fluxes. However, observed vapour concentrations do not allow us disentangle contributions of different processes, such as evaporation, mixing, cloud microphysics, overall moisture budget. As natural tracer, stable isotopes provide access sources phase change history...
<div> <p>During a cold-air outbreak (CAO) cold polar airmass flows from the frozen land or ice surface, over marginal zone (MIZ), then out comparatively warm open ocean. This constitutes dramatic change in surface temperature, roughness and moisture availability, typically causing rapid atmospheric boundary layer. Consequently, CAOs are associated with range of severe mesoscale weather phenomena accurate forecasting is crucial. Over...