Sruise Report, RV ATAIR, Cruise 0671013-1, Bremerhaven —- Skagen - Aberdeen, 19 Jul — 11 Aug 2022 | 35 
7. 
Underway Measurements 
A variety of routine underway measurements were carried out during cruise 067/073-1. Among 
the acquired data of interest were navigational information, near surface hydrography (temper- 
ature, conductivity, and thus salinity) measured by the vessel's thermosalinograph (TSG), 
near-surface fluorescence and turbidity obtained from a dual-wavelength ECO sensor attached 
to the TSG system, as well as meteorological parameters and water temperature recorded by 
the weather station operated by the German Weather Service (DWD) under the identifier 
CVTKCAL. Navigational and meteorological data was recorded from the beginning of the 
zruise on, recording of additional underway data was interrupted during the port stay in Ska- 
gen, Denmark, when transiting through the Dutch EEZ, and while operating within the Swedish 
territorial waters. It was resumed afterwards. Data was logged in time steps of 1 second by the 
vessel’s DSHIP system. All underway data relevant to this cruise were exported from the 
DSHIP database on a daily basis. Water depths were measured by a single-beam echo- 
sounder along the cruise track and on hydrographic stations. Depths provided by the vessel’s 
acho-sounding device result in water depths when the vessels’s draft of 5 m is added. Any 
further processing or quality control of water depth data was not carried out. 
7.1 
Ship’s Meteorological Staticn 
The autonomous weather station installed aboard RV ATAIR and operated by the DWD auto- 
matically records every second all meteorological standard parameters like wind speed and 
direction, air temperature and air pressure, relative humidity and surface water temperature 
and others. While corresponding data is sent directly to the Global Telecommunication System 
(GTS), it is also fed into the DSHIP database. Figure 7.1 provides an overview on the mete- 
arological conditions encountered during cruise 067/073-1. Raw data was smoothed by apply- 
ing a moving median filter. 
The average air temperature throughout the cruise was 16.1°C, temperatures ranged from 
10.7°C to 30°C, the latter at the very beginning of the cruise. Maximum water temperatures 
axceeded 20°C right at the beginning of the cruise, minum water temperatures were 11.7°C, 
the average was 15.9°C. Average air pressure was 1017.2 hPa, and pressures ranged from 
1004.2 hPa to 1027.9 hPa. Notable periods of absolute wind speeds exceeding 7 Bf were 
observed on 21 July 2022, 26 July 2022, 02 August 2022, and on 05/06 August 2022. The 
average wind speed throughout the cruise was 7.82 m/s, which corresponds to a wind strength 
of 4 Bf. The maximum wind speed was 20.5 m/s, corresponding to 8 Bf. Figure 7.2 displays 
the spatial distribution of absolute wind speeds and directions (15 min average values) along 
the cruise track.