NARVAL
The NARVAL series of airborne research flights using the German research aircraft HALO have had two phases: NARVAL 1 which flew in December 2013 and NARVAL 2 which flew in August 2016. The goal of NARVAL was to supplement long-term measurements at the Barbados Cloud Observatory with the aim of better understanding the role of shallow clouds in mediating the Earth’s radiative response to warming, so-called cloud feedbacks. NARVAL2 also began to explore the link between clouds and circulation in preparation for EUREC4A, and factors influencing deep convection within the Atlantic ITCZ. To date eighteen research flights over the tropical Atlantic have performed, and the data is made available to the community subject to the access restrictions and policies below.
NARVAL (1 & 2) Data Access:
NARVAL has adopted an open data policy. This means that we do not intend to police the use of, or access to, the data. Instead we rely on the good will and scientific integrity of those interested in using the data to respect the efforts of those whose were responsible for its collection by adhering to the two guidelines below:
1. No redistribution: Groups who are using the data are asked not to redistribute this data, but rather refer those interested in accessing the data to the original source, and these guidelines for the data use.
2. Coordinated Use and Acknowledgement: Unlike in some other contexts the NARVAL data is made available through the individual efforts and particular funding of a number of independent research groups. Often the data that is collected represents the fruits of many years of effort to develop, certify and operate an instrument. This effort is often connected to individual research projects, and even PhD projects. For this reason we consider it a matter of scientific integrity for users to respect the priority of those who collected the data, by coordinating your planned use with the instrument PIs (listed below), and making an effort to explicitly and clearly acknowledge the origin of the data when it is presented to a broader community in the form of publications or presentations.
3. For publications that include NARVAL 1 and/or NARVAL 2 data, include the following in your acknowledgements: The data used in this publication was gathered in the NARVAL 1/NARVAL 2 (Next-generation Aircraft Remote-Sensing for Validation Studies) campaign and is made available through [insert name of the institute]. NARVAL was funded with support of the Max Planck Society, the German Research Foundation (DFG), the European Research Council (ERC), the German Meteorological Weather Service (DWD) and the German Aerospace Center (DLR).
| Instrument | Contact Person | Data |
| HAMP-Radar |  Lutz Hirsch | ftp server |
| HAMP-Radiometer | Mario Mech | ftp server |
| SMART | Manfred Wendisch | database |
| SpecMACS | Bernhard Mayer | Imu site |
| WALES | Martin Wirth | ftp server |
| Dropsondes | Bjorn Stevens | ftp server |
| BAHAMAS | Bjorn Stevens | ftp server |
Documents:
Barbados Cloud Observatory
Figure Gallery:
NARVAL1 Flights
NARVAL2_Dropsondes
Planning and Related Meetings:
7-9 December, 2016: NARVAL2-EUREC4A workshop in Cologne 
Agenda, Presentations
23-28 April, 2017: EGU General Assembly Special Session Link
Contact:
Bjorn Stevens email
Max Planck Institute for Meteorology, Hamburg
Funding:
NARVAL is funded with support of the the Max Planck Society, the German Research Foundation, the European Research Council through an Advanced Grant, the German Meteorological Service (DWD) and the German Aerospace Center (DLR).
