Titolo | Interannual variability of atmospheric CO2 in the Mediterranean: Measurements at the island at Lampedusa |
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Tipo di pubblicazione | Articolo su Rivista peer-reviewed |
Anno di Pubblicazione | 2003 |
Autori | Chamard, P., Thiery F., Di Sarra Alcide, Ciattaglia L., De Silvestri Lorenzo, Grigioni P., Monteleone Francesco, and Piacentino Salvatore |
Rivista | Tellus, Series B: Chemical and Physical Meteorology |
Volume | 55 |
Paginazione | 83-93 |
ISSN | 02806509 |
Parole chiave | annual variation, Atmospheric chemistry, Carbon dioxide, El Nino-Southern Oscillation, greenhouse gas, Italy, wind direction |
Abstract | The atmospheric concentration of carbon dioxide and other greenhouse gases has been measured weekly since 1992 at the island of Lampedusa, in the Mediterranean sea. Lampedusa is a small island located approximately 100 km east of Tunisia, and 250 km south of Sicily. The 10-yr CO2 data set has been analysed to quantify trends, and characterize semi-annual, annual and inter-annual variability. The data show an average trend of + 1.7 ppmv yr-1; the average annual cycle has an amplitude of about 9 ppmv. In the period of investigation the annual growth rate varies between 0.5 and 4.5 ppmv yr-1, and the amplitude of the annual cycle between 7 and 11 ppmv yr-1. By comparing the observed growth rate with recent estimates of carbon dioxide emissions, it is calculated that 58-61% of the emitted CO2 remains in the atmosphere. The CO2 growth rate appears to be related to large-scale dynamic phenomena, primarily El Nin̄o/Southern Oscillation (ENSO). An evident signature of the 1997-98 El Nin̄o is apparent in the CO2 record, and corresponds to a weakening of the exchange with the biosphere. A high correlation between the global average temperature and the 12-month average carbon dioxide growth rate is also found. Wind direction displays a significant inter-annual variability throughout the measurement period, possibly influencing the observed evolution of the CO2 concentration. |
Note | cited By 19 |
URL | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0037565183&doi=10.1034%2fj.1600-0889.2003.00048.x&partnerID=40&md5=7bd113cd177992bd0c3bb2efe1eb495c |
DOI | 10.1034/j.1600-0889.2003.00048.x |
Citation Key | Chamard200383 |