4 Short Cruise Report, RV ATAIR, Cruise 067I041-1, Bremerhaven – Thybor?n – Aberdeen, 22 Jul – 14 Aug 2025 ? What are the outflow conditions from the Baltic Sea in summer of 2025? ? What is the lateral distribution and concentration level of selected radionuclides in summer 2025? ? What is the internannual variability of dissolved inorganic carbon and alkalinity? ? What are the drivers for this variability? ? What is the distribution of mircoplastics and changes thereof in the highly dynamic North Sea? ? What are sources and distribution of technologically critical and other trace metals in the North Sea? ? What is the concentration of pesticides in air and water in the northern half of the North Sea in summer 2025? Overarching objectives addressing temporal changes on different time scales are: ? How do changes in the Northeast Atlantic happening on time scales ranging from seasonal to decadal affect the North Sea? ? Which processes are associated with the variability of the North Atlantic Oscillation (NAO) and to what extent?