Meteorologie

Klose, Brigitte; Klose, H.

doi:10.1007/978-3-662-43578-6

Cited by 6 publications

(3 citation statements)

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“…Based on the height difference between 30 min of flight we calculated climb rates, and the sum of all height gains across a flight bout (only positive climbs rates). Short-term changes in air pressure within 3-h are reported to be 1–2 hPa ([ 47 ] p. 117). Therefore, we expected errors in climb rate estimates due to changes in weather conditions to be insignificant.…”

Section: Methodsmentioning

confidence: 99%

Miniaturized multi-sensor loggers provide new insight into year-round flight behaviour of small trans-Sahara avian migrants

et al. 2018

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BackgroundOver the past decade, the miniaturisation of animal borne tags such as geolocators and GPS-transmitters has revolutionized our knowledge of the whereabouts of migratory species. Novel light-weight multi-sensor loggers (1.4 g), which harbour sensors for measuring ambient light intensity, atmospheric pressure, temperature and acceleration, were fixed to two long-distance migrant bird species - eurasian hoopoe (Upupa epops) and great reed warbler (Acrocephalus arundinaceus). Using acceleration and atmospheric pressure data recorded every 5 and 30 min, respectively, we aimed at reconstructing individual diurnal and seasonal patterns of flight activity and flight altitude and thereby, at describing basic, yet hitherto unknown characteristics of migratory flight behaviour. Furthermore, we wanted to characterise the variability in these migration characteristics between individuals, species and migration periods.ResultsThe flight duration from breeding to sub-Saharan African non-breeding sites and back was more variable within than between the species. Great reed warblers were airborne for a total of 252 flight hours and thus, only slightly longer than eurasian hoopoes with 232 h. With a few exceptions, both species migrated predominantly nocturnally - departure around dusk and landing before dawn. Mean flight altitudes were higher during pre- than during post-breeding migration (median 1100 to 1600 m a.s.l.) and flight above 3000 m occurred regularly with a few great reed warblers exceeding 6000 m a.s.l. (max. 6458 m a.s.l.). Individuals changed flight altitudes repeatedly during a flight bout, indicating a continuous search for (more) favourable flight conditions.ConclusionsWe found high variation between individuals in the flight behaviour parameters measured – a variation that surprisingly even exceeded the variation between the species. More importantly, our results have shown that multi-sensor loggers have the potential to provide detailed insights into many fundamental aspects of individual behaviour in small aerial migrants. Combining the data recorded on the multiple sensors with, e.g., remote sensing data like weather and habitat quality on the spatial and temporal scale will be a great step forward to explore individual decisions during migration and their consequences.Electronic supplementary materialThe online version of this article (10.1186/s40462-018-0137-1) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

Miniaturized multi-sensor loggers provide new insight into year-round flight behaviour of small trans-Sahara avian migrants

et al. 2018

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“…The water vapor pressure over the IL solutions ( p H 2 O ) was calculated from the measured relative humidity (% rH), the temperature ( T ) and the saturated vapor pressure of water ( e w ) using the Magnus equation.see ref e normalw ( T ) = 6.1078 · exp ( 17.08085 · T 234.175 + T ) see ref % rH = p normalH 2 normalO ( T ) e normalw ( T ) · 100 p normalH 2 normalO ( T ) = % rH 100 · 6.1078 · exp ( 17.08085 · T 234.175 + T ) …”

Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Screening of Ionic Liquid/H₂O Working Pairs for Application in Low Temperature Driven Sorption Heat Pump Systems

Popp

Bösmann

Wölfel

et al. 2015

ACS Sustainable Chem. Eng.

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Due to the known corrosion and crystallization issues of LiBr/H2O, the state-of-the-art working pair in sorption heat pump (SHP) systems, research into alternative working pairs is of high practical relevance. We have studied a wide range of ionic liquids (ILs) for this application in order to find potential new systems with enhanced performance. The screening was conducted with a focus on vapor pressure measurements of, in total, 74 examined working pairs. As common vapor–liquid-equilibrium measurements are very precise but rather time-consuming, we developed a new setup allowing a fast relative determination of humidities with very small sample volumes for screening purposes. By this method we identified seventeen IL/H2O working pairs fulfilling the technical relevant criterion of a water vapor pressure p H2O ≤ 10 mbar at T = 308 K with an IL content of less than 80 wt % (w IL < 0.8). Further evaluation of these candidates with respect to their thermal stability and viscosity allowed us to identify [MMIM][HCOO]/H2O, [MMIM][OAc]/H2O, [MMIM][C2H5COO]/H2O, [Me4N][HCOO]/H2O, [Me4N][OAc]/H2O and [Me4N] [C2H5COO]/H2O as the most promising IL/H2O systems for a possible application in SHP systems.

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Weller¹,

Fahrion²,

Horn³

et al. 2016

Baukonstruktion Im Klimawandel

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Meteorologie

Cited by 6 publications

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Miniaturized multi-sensor loggers provide new insight into year-round flight behaviour of small trans-Sahara avian migrants

Miniaturized multi-sensor loggers provide new insight into year-round flight behaviour of small trans-Sahara avian migrants

Screening of Ionic Liquid/H₂O Working Pairs for Application in Low Temperature Driven Sorption Heat Pump Systems

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Meteorologie

Cited by 6 publications

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Miniaturized multi-sensor loggers provide new insight into year-round flight behaviour of small trans-Sahara avian migrants

Miniaturized multi-sensor loggers provide new insight into year-round flight behaviour of small trans-Sahara avian migrants

Screening of Ionic Liquid/H2O Working Pairs for Application in Low Temperature Driven Sorption Heat Pump Systems

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Screening of Ionic Liquid/H₂O Working Pairs for Application in Low Temperature Driven Sorption Heat Pump Systems