@article {nagel2019,
	title = {Measurement of air-sea gas transfer velocities in the Baltic Sea},
	journal = {Ocean Science},
	volume = {15},
	year = {2019},
	pages = {235{\textendash}247},
	doi = {10.5194/os-15-235-2019},
	author = {Leila Nagel and Kerstin E. Krall and Bernd J{\"a}hne}
}
@article {krall2015,
	title = {Comparative heat and gas exchange measurements in the Heidelberg Aeolotron, a large annular wind-wave tank},
	journal = {Ocean Sci.},
	volume = {11},
	year = {2015},
	pages = {111--120},
	doi = {10.5194/os-11-111-2015},
	author = {Leila Nagel and Kerstin Ellen Krall and Bernd J{\"a}hne}
}
@phdthesis {nagel2014,
	title = {Active Thermography to Investigate Small-Scale Air-Water Transport Processes in the Laboratory and the Field},
	volume = {Dissertation},
	year = {2014},
	publisher = {Institut f{\"u}r Umweltphysik, Fakult{\"a}t f{\"u}r Chemie und Geowissenschaften, Univ.\ Heidelberg},
	url = {http://www.ub.uni-heidelberg.de/archiv/16831},
	author = {Leila Nagel}
}
@article {nagel2014a,
	title = {Comparative heat and gas exchange measurements in the Heidelberg Aeolotron, a large annular wind-wave tank},
	journal = {Ocean Sci. Discuss.},
	volume = {11},
	year = {2014},
	pages = {1691--1718},
	doi = {10.5194/osd-11-1691-2014},
	author = {Leila Nagel and Kerstin Ellen Krall and Bernd J{\"a}hne}
}
@conference {kraeuter2014a,
	title = {High-resolution 2-D fluorescence imaging of gas transfer at a free water surface},
	booktitle = {Ocean Science Meeting, 23--28. 02. 2014, Honolulu Hawaii},
	year = {2014},
	abstract = {A novel 2-D fluorescence imaging technique has been developed to visualize gas exchange between air and water using ammonia as a tracer. Fluorescence is stimulated by high-power LEDs and is observed from above with a low-noise, high-resolution and high-speed camera. The invasion of ammonia into water leads to an increase in pH (from a starting value of 4), which is visualized with a fluorescent dye. The flux of ammonia can be controlled by controlling its air-side concentration. A higher flux leads to an increase of the thickness of the layer, from which fluorescent light is emitted (pH > 7). In this way, a varying fraction of the thickness of the aqueous mass boundary layer is imaged. In addition to the fluorescence measurement, we conducted collocated and simultaneous thermography and wave imaging measurements. With this data set, it is possible to compare heat and gas transfer and to investigate the effect of waves on both transfer processes. First results will be presented.},
	doi = {10.5281/zenodo.12330},
	author = {Christine Kr{\"a}uter and Darya Trofimova and Leila Nagel and Bernd J{\"a}hne}
}
@conference {nagel2012,
	title = {Active Thermography as a Link between Laboratory and Field Studies},
	booktitle = {SOLAS Open Science Conference, Washington State, USA},
	year = {2012},
	author = {Leila Nagel and Kerstin E. Richter and Bernd J{\"a}hne}
}
@conference {jaehne2012g,
	title = {Investigation of small-scale air-sea interaction processes by active thermography},
	booktitle = {Geoscience and Remote Sensing Symposium (IGARSS)},
	year = {2012},
	pages = {358--361},
	doi = {10.1109/IGARSS.2012.6351564},
	author = {Bernd J{\"a}hne and Leila Nagel}
}
@conference {schimpf2011b,
	title = {The 2009 SOPRAN active thermography pilot experiment in the Baltic Sea},
	booktitle = {Gas Transfer at Water Surfaces 2010},
	year = {2011},
	pages = {358--367},
	doi = {10.5281/zenodo.14956},
	url = {http://hdl.handle.net/2433/156156},
	author = {Uwe Schimpf and Leila Nagel and Bernd J{\"a}hne},
	editor = {S. Komori and W. R. McGilles and R. Kurose}
}
@conference {schimpf2011,
	title = {Lock-in thermography at the ocean surface: a local and fast method to investigate heat and gas exchange between ocean and atmosphere},
	booktitle = {DPG Fr{\"u}hjahrstagung Dresden, Fachverband Umweltphysik},
	year = {2011},
	abstract = {Heat is used as a proxy tracer for gases to study the transport processes across the sea-surface interface to obtain a detailed insight into the diffusive and turbulent processes controlling the transport. A carbon dioxide laser forces a periodically varying heat flux density onto the water surface and the amplitude damping and phase shift of the sea surface temperature is measured from infrared image sequences. The transport process can be treated by linear system theory and the relation between the input signal (periodically varying surface flux density) and the output (surface temperature) is estimated. Within the framework of the SOPRAN initiative three field experiments in the Baltic Sea were conducted. The locally derived heat transfer rates are scaled to gas transfer rates, which are in good agreement with empirical gas transfer wind speed relationships for moderate winds speeds. At high wind speed, the transfer rates are lower, which is explained by the fact that heat transport is insensitive to bubble-mediated gas transfer, i.e. it measures only a part of the transfer process directly at the water surface. Together with eddy covariance measurements a significant improvement of the parameterization of heat and gas transfer velocities can be expected.},
	url = {http://www.dpg-verhandlungen.de/year/2011/conference/dresden/part/up/session/1/contribution/28},
	author = {Uwe Schimpf and Leila Nagel and Bernd J{\"a}hne}
}
@mastersthesis {nagel2009,
	title = {Bestimmung der Temperaturdifferenz {\"u}ber die viskose Grenzschicht mit Hilfe des Oberfl{\"a}chenerneuerungsmodells},
	year = {2009},
	school = {IWR, Fakult{\"a}t f{\"u}r Physik und Astronomie, Univ.\ Heidelberg},
	author = {Leila Nagel}
}
@conference {nagel2009a,
	title = {First results from the 2009 SOPRAN active thermography pilot experiment in the Baltic Sea},
	booktitle = {Poster abstracts SOLAS Open Science Conference, Barcelona, 16--19 Sep. 2009},
	year = {2009},
	abstract = {To improve the parametrization of the transfer velocities a novel active thermography system was developed. At the end of SOPRAN 1 it has been deployed in a pilot experiment at the bow of the research vessel FS Alkor in the Baltic sea. A periodically varying heat flux is applied by a CO2-laser. The transfer velocity is estimated by the amplitude damping and phase shift of the temperature signal in the Fourier domain, gained from the infrared images of the water surface. First results are shown. The system will be used in the second phase of the SOPRAN project on a regular base. Together with eddy covariance measurements deployed from FINO 2, a significant improvement of the parametrization of the heat an gas transfer velocities can be expected.},
	author = {Leila Nagel and Uwe Schimpf and Bernd J{\"a}hne}
}
@conference {garbe2009b,
	title = {Thermographic measurements of the temperature difference across the air- water interface: results from experimental and numerical studies},
	booktitle = {Poster abstracts SOLAS Open Science Conference, Barcelona, 16--19 Sep. 2009},
	year = {2009},
	abstract = {Thermography is a powerful tool for analyzing spatially and temporally resolved the transport of heat across the air-water interface. In this contribution, measurements of the temperature difference across the aqueous boundary layer will be presented. These measurements are based on a statistical analysis of the temperature distribution directly at the water surface. This technique will be presented together with results of measurements conducted in the laboratory and in the field. These thermographic measurements are compared to measurements with standard techniques. Also, the same statistical analysis is performed on data from direct numerical simulation of a wind-driven, aqueous turbulent boundary-layer flow. The agreement between thermography and simulation is very good. Moreover, the full 3D simulations are used for a thorough analysis and validation of the thermographic technique and help to discuss the results.},
	author = {Christoph S. Garbe and Leila Nagel and Hung, L. -P. and Tsai, W. -T.}
}
