Quasi-Lagrangian air mass matches during HALO-(AC)3: Matches occuring over consecutive days

One of the main goals of the HALO-(AC)3 Arctic airborne campaign conducted in spring 2022 was a quasi-Lagrangian sampling of air masses. This means that the same air masses were to be sampled twice. Such a measurement strategy allows for concrete observations of air mass transformations, which can f...

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Bibliographic Details
Main Authors: Kirbus, Benjamin, Ehrlich, André, Schäfer, Michael, Wendisch, Manfred
Format: Dataset
Language:English
Published: PANGAEA 2024
Subjects:
AC
AC3
Aircraft
Arctic
Arctic Amplification
Date/Time of event
Event label
HALO
HALO_220312a
HALO_220313a
HALO_220314a
HALO_220315a
HALO_220320a
HALO_220328a
HALO_220329a
HALO_220407a
HALO_220410a
HALO_220411a
HALO_AC3
HALO-(AC)³
Image
Lagrangian data
Optional event label
RF02
RF03
RF04
RF05
RF07
RF09
RF10
RF14
RF16
RF17
Text file
trajectories
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.967148
https://doi.org/10.1594/PANGAEA.967148
Description
Summary:One of the main goals of the HALO-(AC)3 Arctic airborne campaign conducted in spring 2022 was a quasi-Lagrangian sampling of air masses. This means that the same air masses were to be sampled twice. Such a measurement strategy allows for concrete observations of air mass transformations, which can for example be used to benchmark weather models. After finishing the campaign, trajectory calculations were conducted for all flights of the HALO aircraft to check whether the flight strategy was a success. For this, the trajectory calculation tool Lagranto was used in conjunction with wind fields from the ERA5 reanalysis. Latter has an output resolution of around 30 km and one hour. The hourly data was bi-linearly interpolated to one minute resolution. Air masses were initialized temporally every one minute along the flight track of HALO, and vertically every 5 hPa between 250 hPa and 10 hPa above the ground level. Horizontally, air masses were started within a 30 km radius circle centered around the location of HALO. In each circle, 30 air masses were initialized evenly spaced approximately every 10 km, allowing for a better statistical analysis. Trajectories were then calculated in one-minute steps up to 32 hours forward in time. At typical HALO flight times of up to 10 hours, around 2.7 million trajectories were calculated per research flight. A quasi-Lagrangian match is registered if the same air mass is seen again below HALO on the subsequent day and within the same 30 km radius.

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