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Trends and inter-annual variability of methane emissions derived from 1979-1993 global CTM simulations
Trends and inter-annual variability methane emissions global CTM simulations
2009/3/10
The trend and interannual variability of methane sources are derived from multi-annual simulations of tropospheric photochemistry using a 3-D global chemistry-transport model. Our semi-inverse analysi...
The trends and dependencies between air and water temperatures in lakes in northern Poland in 1961–2000
physical limnology climate changes lake water temperature
2009/3/3
Over 40 years, from 1961–2000, daily mean values of surface lake water temperatures at 0.4 m depth in six lakes in northern Poland were recorded with nearby mean daily air temperatures at 2 m. Air tem...
On the changing seasonal cycles and trends of ozone at Mace Head, Ireland
changing seasonal cycles ozone Mace Head Ireland
2009/2/19
A seasonal-trend decomposition technique based on a locally-weighted regression smoothing (Loess) approach has been used to decompose monthly ozone concentrations at Mace Head (Ireland) into trend, se...
Trends of halon gases in polar firn air: implications for their emission distributions
halon gases polar firn air emission distributions
2009/2/13
Four halons (H-1301, H-1211, H-2402 and H-1202) have been measured in air samples collected from polar firn from Dome Concordia (Dome C), Antarctica, from Devon Island, Canada and the North Greenland ...
Simulation of stratospheric water vapor trends: impact on stratospheric ozone chemistry
stratospheric water vapor trends stratospheric ozone chemistry
2009/2/9
A transient model simulation of the 40-year time period 1960 to 1999 with the coupled climate-chemistry model (CCM) ECHAM4.L39(DLR)/CHEM shows a stratospheric water vapor increase over the last two d...
Stratospheric variability and trends in models used for the IPCC AR4
Stratospheric variability and trends models IPCC AR4
2009/1/21
Atmosphere and ocean general circulation model (AOGCM) experiments for the Intergovernmental Panel on Climate Change Fourth Assessment Report (AR4) are analyzed to better understand model variability ...
Observations of the diurnal and seasonal trends in nitrogen oxides in the western Sierra Nevada
diurnal and seasonal trends nitrogen oxides western Sierra Nevada
2009/1/20
Observations of speciated nitrogen oxides, namely NO2, total peroxy nitrates (ΣPNs), total alkyl nitrates (ΣANs), and HNO3 by thermal dissociation laser induced fluorescence (TD-LIF), and supporting c...
The total ozone field separated into meteorological regimes – Part II: Northern Hemisphere mid-latitude total ozone trends
total ozone field meteorological regimes Northern Hemisphere mid-latitude ozone trends
2009/1/19
Previous studies have presented clear evidence that the Northern Hemisphere total ozone field can be separated into distinct regimes (tropical, midlatitude, polar, and arctic) the boundaries of which ...
Variability and trends in total and vertically resolved stratospheric ozone based on the CATO ozone data set
stratospheric ozone CATO ozone data set
2009/1/16
Trends in ozone columns and vertical distributions were calculated for the period 1979–2004 based on the ozone data set CATO (Candidoz Assimilated Three-dimensional Ozone) using a multiple linear regr...
20th century trends and budget implications of chloroform and related tri-and dihalomethanes inferred from firn air
budget implications of chloroform tri-and dihalomethanes firn air
2009/1/13
Four trihalomethane (THM; CHCl3, CHBrCl2, CHBr2Cl and CHBr3) and two dihalomethane (DHM; CH2BrCl and CH2Br2) trace gases have been measured in air extracted from polar firn collected at the North Gre...
The influence of polar vortex ozone depletion on NH mid-latitude ozone trends in spring
polar vortex ozone depletion NH mid-latitude ozone spring
2009/1/13
Reverse domain-filling trajectory calculations have been performed for the years 1993, 1995, 1996, 1997, and 2000 to calculate the spreading of ozone depleted air from the polar vortex to midlatitudes...
Aerosol light absorption in the North Atlantic: trends and seasonal characteristics during the period 1989 to 2003
Aerosol light absorption the North Atlantic trends and seasonal characteristics
2009/1/8
Aerosol light attenuation on quartz fibre filters has been measured since February 1989 at the Mace Head Atmospheric Research station near Carna, Co. Galway, Ireland, using an Aethalometer. The freque...
Ozone levels in Europe are changing. Emissions of ozone precursors from Europe (NOx, CO and non-methane hydrocarbons) have been substantially reduced over the last 10–15 years, but changes in ozone le...
Trends and variability in stratospheric mixing: 1979–2005
stratospheric mixing transport of ozone tropical source regions
2008/12/24
Changes in climate are likely to drive changes in stratospheric mixing with associated implications for changes in transport of ozone from tropical source regions to higher latitudes, transport of wat...
There is a large uncertainty in the relative roles of human land use, climate change and carbon dioxide fertilization in changing desert dust source strength over the past 100 years, and the overall s...