The multi-seasonal NOy budget in coastal Antarctica and its link with surface snow and ice core nitrate: results from the CHABLIS campaign

نویسندگان

  • A. E. Jones
  • E. W. Wolff
  • D. Ames
  • S. J.-B. Bauguitte
  • K. C. Clemitshaw
  • Z. Fleming
  • G. P. Mills
  • A. Saiz-Lopez
  • R. A. Salmon
  • W. T. Sturges
  • D. R. Worton
چکیده

Measurements of a suite of individual NOy components were carried out at Halley station in coastal Antarctica as part of the CHABLIS campaign (Chemistry of the Antarctic Boundary Layer and the Interface with Snow). Conincident measurements cover over half a year, from austral winter 2004 through to austral summer 2005. Results show clear dominance of organic NOy compounds (PAN and MeONO2) during the winter months, with low concentrations of inorganic NOy. During summer, concentrations of inorganic NOy compounds are considerably greater, while those of organic compounds, although lower than in winter, are nonetheless significant. The relative concentrations of the alkyl nitrates, as well as their seasonality, are consistent with an oceanic source. Multi-seasonal measurements of surface snow nitrate correlate strongly with inorganic NOy species (especially HNO3) rather than organic. One case study in August suggested that, on that occasion, particulate nitrate was the dominant source of nitrate to the snowpack, but this was not the consistent picture throughout the measurement period. An analysis of NOx production rates showed that emissions of NOx from the snowpack overwhelmingly domCorrespondence to: A. E. Jones ([email protected]) inate over gas-phase sources. This result suggests that, for certain periods in the past, the flux of NOx into the Antarctic boundary layer can be calculated from ice core nitrate data.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Chemistry of the Antarctic Boundary Layer and the Interface with Snow: an overview of the CHABLIS campaign

CHABLIS (Chemistry of the Antarctic Boundary Layer and the Interface with Snow) was a collaborative UK research project aimed at probing the detailed chemistry of the Antarctic boundary layer and the exchange of trace gases at the snow surface. The centre-piece to CHABLIS was the measurement campaign, conducted at the British Antarctic Survey station, Halley, in coastal Antarctica, from January...

متن کامل

HCHO measurements during CHABLIS in coastal Antarctica

Gas phase formaldehyde concentrations were measured during the 2004-5 CHABLIS campaign at Halley research station, Antarctica. Data coverage span from March 2004 through to January 2005 thus capturing the majority of the year. Factors controlling HCHO concentration include local chemical sources and sinks, and exchange with the 5 snow surface. The measured seasonality is in line with previous o...

متن کامل

Seasonal variations of accumulation and the isotope record in ice cores: a study with surface snow samples and firn cores from Neumayer station, Antarctica

At the German wintering base Neumayer, an intensive glacio-meteorologicalprogrammehasbeen carried out during the last two decades. A completemeteorological dataset and data from surface snow samples, snow pits, firn cores and weekly accumulation measurements from a stake array are available.We first investigated the attenuation of the seasonal ̄O signal due to water-vapour diffusion in the snow...

متن کامل

Evidence of NOx production within or upon ice particles in the Greenland snowpack

NOs and NOv were determined in the interstitial air of surface snow and in ambient air at Summit, Greenland. NOs levels in interstitial air were 3 to > 10 times those in ambient air, and were generally greater than ambient NOy levels. [NO y] in interstitial air varied diurnally in a manner consistent with photochemical generation within the snowpack. These observations imply that photochemical ...

متن کامل

ICESat observations of seasonal and interannual variations of sea-ice freeboard and estimated thickness in the Weddell Sea, Antarctica (2003–2009)

Sea-ice freeboard heights for 17 ICESat campaign periods from 2003 to 2009 are derived from ICESat data. Freeboard is combined with snow depth from Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E) data and nominal densities of snow, water and sea ice, to estimate sea-ice thickness. Sea-ice freeboard and thickness distributions show clear seasonal variations that reflec...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2008