@incollection {jaehne2007f,
	title = {The influence of intermittency on air/water gas transfer measurements},
	year = {2007},
	publisher = {Springer-Verlag},
	abstract = {This paper theoretically investigates the influence of intermittency on determining average transfer velocities using different measuring techniques. It is shown that all measuring techniques can significantly be biased by intermittency. Mass balance and eddy correlation measurements are only biased when the concentration difference between the air and the water is spatially or temporally inhomogeneous over the measurement interval. Mean transfer velocities calculated either from mean boundary layer thicknesses or from thermographic techniques, which compute the mean transfer velocity either from concentration differences of from time constants, are biased toward lower values. The effects can be large and a simple stochastic bimodal model is used to estimate the effect.},
	doi = {10.1007/978-3-540-36906-6_18},
	author = {Bernd J{\"a}hne and Christopher Popp and Uwe Schimpf and Christoph S. Garbe and Bernd J{\"a}hne},
	editor = {Christoph S. Garbe and Handler, R. A.}
}
@conference {schimpf2006,
	title = {Active thermography: a local and fast method to investigate heat and gas exchange between ocean and atmosphere},
	booktitle = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Spring Conference, Heidelberg, 15.-17.03.2006},
	year = {2006},
	publisher = {Deutsche Physikalische Gesellschaft},
	organization = {Deutsche Physikalische Gesellschaft},
	url = {http://www.dpg-verhandlungen.de/2006/heidelberg/up.html},
	author = {Uwe Schimpf and Christopher Popp and Bernd J{\"a}hne}
}
@phdthesis {popp2006,
	title = {Untersuchung von Austauschprozessen an der Wasseroberfl{\"a}che aus Infrarot-Bildsequenzen mittels frequenzmodulierter W{\"a}rmeeinstrahlung},
	year = {2006},
	publisher = {Institut f{\"u}r Umweltphysik, Fakult{\"a}t f{\"u}r Physik und Astronomie, Univ.\ Heidelberg},
	abstract = {The study presents a new technique for measuring the gas transfer rate at a free water surface with high temporal and spatial resolution, a method suitable for field experiments. The approach is based on the Controlled Flux Technique (CFT) using heat as a proxy tracer for gas exchange. A periodically varying heat flux at water surface is used. The heat flux is generated by a 100 W CO2-laser, while a highly sensitive infrared camera measures the temperature response of the water surface. Heat - and consequently gas transfer rates - can be deduced from the analysis of the spectral amplitude attenuation at water surface. Furthermore, the approach presented allows direct insight into the transport mechanisms of gas exchange processes by an analysis of the phase shift observed at water surface. A first series of measurements at the Heidelberg wind wave facility AEOLOTRON shows that the spectral amplitude attenuation is in keeping with model predictions. The calculated transfer rates for CO2 are also well in accordance with results from other laboratory and field experiments. Contrary to the amplitude attenuation, the calculated phase shifts differ signicantly from model predictions, especially for high wind speeds. This effect, observed for the first time, can be interpreted as being caused by the intermittence of transfer processes. This would indicate that stochastic processes play a larger role in gas transfer than assumed so far.},
	url = {http://www.ub.uni-heidelberg.de/archiv/6489},
	author = {Christopher Popp}
}
@conference {jaehne2005,
	title = {Air-Sea Gas Transfer; Schmidt Number dependency and intermittency},
	booktitle = {Presented at: International Liege Colloquium on Ocean Dynamics, Gas Transfer at Water Surfaces},
	year = {2005},
	author = {Bernd J{\"a}hne and Nielsen, R. and Christopher Popp and Uwe Schimpf and Christoph S. Garbe}
}
@conference {jaehne2004e,
	title = {Exchange processes at the ocean surface: their role in coupling atmosphere and ocean, a contribution to the SOLAS project},
	booktitle = {Verhandlungen der Deutschen Physikalischen Gesellschaft, Spring Conference, Munich, 22.-26.03.2004},
	year = {2004},
	publisher = {Deutsche Physikalische Gesellschaft},
	organization = {Deutsche Physikalische Gesellschaft},
	abstract = {Der Stoffaustausch zwischen Atmosph{\"a}re und Ozean ist trotz seiner Bedeutung f{\"u}r die globalen Stoffkreisl{\"a}ufe immer noch wenig verstanden und experimentell schwer zug{\"a}nglich. In den letzten Jahre wurde eine neue Technik entwickelt, die es mittels aktiver Thermographie erlaubt, die Antwortfunktion des Transports durch die wasserseitige viskose Grenzschicht sowohl im Labor als auch im Feld zu messen. Damit ist es nicht nur m{\"o}glich, innerhalb weniger Minuten die Transfergeschwindigkeit f{\"u}r Gase zu messen, sondern auch verschiedene Modelle zu unterscheiden und die Schmidtzahlabh{\"a}ngigkeit zu bestimmen. Dies bedeutet f{\"u}r zuk{\"u}nftige Messungen im Feld, dass Messungen der Konzentrationen von beliebigen Tracern im Wasser und der Atmosph{\"a}re ausreichend sind, um Flussraten relevanter Tracer zwischen Atmosph{\"a}re und Ozean zu bestimmen. Es sind keine aufwendigen und unsicheren direkten Flussraten (z.B. durch Eddykorrelations- oder -akkumulationsmessungen) mehr notwendig. Die neue Technik soll ein wesentliches Bindeglied zwischen den atmosph{\"a}rischen und ozeanographischen Untersuchungen des internationalen SOLAS-Projekt werden.},
	url = {http://old.dpg-tagungen.de/archive/2004/up_1.html},
	author = {Bernd J{\"a}hne and Uwe Schimpf and Christopher Popp and Christoph S. Garbe}
}
