EUREC4A

EUREC4A, the Field Study, is a French-German initiative in support of the World Climate Research Programme's Grand Science Challenge on Clouds, Circulation and Climate Sensitivity. EUREC4A will take place between 20 January and 20 February 2020 with operations based out of Barbados.

EUREC4A’s core measurements are designed to test hypotheses related to the interplay between clouds, convection and circulation and their role in climate change. To do so EUREC4A will build on a decade of measurements in the tropical Atlantic; measurements initiated with the establishment of the Barbados Cloud Observatory in 2010, and continued with two aircraft campaigns, NARVAL in December 2013, and NARVAL2, in August 2016, with the German High Altitude Long Range research Aircraft HALO. More information about these experiments is provided on the NARVAL pages here.

The core, and presently supported, measurements will focus on quantifying how cloud amount in shallow cumulus layers responds to changes in the large-scale environment, how shallow clouds contribute to convective aggregation, and test retrievals of cloud and atmospheric properties. Through international cooperation complementary objectives could be explored. These range from tests of ocean mixing processes, to processes influencing convective organization, to the much broader question of the dynamics of the Atlantic Tropical Convergence Zone.

An exciting component of NARVAL2 - EUREC4A is that high resolution modelling will be performed in support of field operations. For NARVAL2, through the DWD sponsored HErZ cooperation with MPI-M, 2.5 km cloud resolving simulations are being performed over the entire tropical Atlantic. These simulations include a 1.25 km nest over the western Atlantic and a yet finer (300 m) simulation nest over the area of flight operations. A prototype simulation, showing the wind field is illustrated in the animated gif below. During EUREC4A we anticipate being able to perform 300 m resolution simulations over the entire domain with finer (50-100 m) nested simulations over the flight area. Opens external link in current windowLink to the DKRZ cloud storage system

The animation shows convection resolving ICON simulations over the tropical Atlantic accompanying the NARVAL campaigns (by Daniel Klocke, DWD and Matthias Brueck, MPI-M). Emergent phenomena are featured in unprecedented detail, ranging from cold-pools of small cumuli, interacting squall lines of deep convection to hurricanes evolving from breaking easterly waves. Over 40 days are already simulated within the period of NARVAL-I (Dec 2013) and NARVAL-II (Aug 2016). The model resolution is 2.5 km with a nested domain of 1.2 km over the western part of the domain. These results are further used as input to large-eddy simulations with ICON within the HD(CP)2 project.

The nucleus for the Field Study involves the deployment of two research aircrafts, an array of research vessels, advanced ground based remote sensing, a new generation of sophisticated satellite remote sensing and state-of-the-art turbulence-resolving modelling (100 m, over thousands of km). Operations will focus on an area over the shelf oceans east of Barbados (57 W 13 N) for a six week period between 12 January and and 23 February 2020, with aircraft operations between 20 January and 20 February. This period will overlap with ADM-Aeolus and EarthCARE, two flagship satellite platforms of the European Space Agencies Living Planet Programme.    

Documents:
Initiates file downloadEUREC4A: a field campaign to elucidate the couplings between clouds, convection and circulation, submitted, 2017
Opens external link in current windowBarbados Cloud Observatory
Opens external link in current windowWCRP Grand Science Challenge on Clouds, Circulation and Climate Sensitivity
Initiates file downloadDraft White Paper
Initiates file downloadOverview EUREC4A

Figure Gallery:
Initiates file downloadBarbados Cloud Observatory
Initiates file downloadBathymetry near Barbados
Initiates file downloadNARVAL Flights
Initiates file downloadNARVAL2 Flight plans
Initiates file downloadEUREC4A Flight strategy

Planning and Related Meetings:
7-9 December, 2016:  NARVAL2-EUREC4A workshop in Cologne  Initiates file downloadAgenda
23-28 April, 2017: EGU General Assembly Special Session Opens external link in current windowLink

Contact:  
Sandrine Bony Opens window for sending emailemail
Laboratoire de Meteorologie Dynamique (LMD/IPSL), Paris
Bjorn Stevens  Opens window for sending emailemail
Max Planck Institute for Meteorology, Hamburg

If you are interested in joining the NARVAL2-EUREC4A community please Opens external link in current windowsubscribe to the list-server

Funding:
NARVAL2 and EUREC4A are funded with support of the the Opens external link in current windowMax Planck Society, the  Opens external link in current windowGerman Research Foundation, the  Opens external link in current windowEuropean Research Council through an Advanced Grant, the Opens external link in current windowGerman Meteorological Service (DWD) and the Opens external link in current windowGerman Aerospace Center (DLR).