 |
| Titel |
Eight-component retrievals from ground-based MAX-DOAS observations |
| VerfasserIn |
H. Irie, H. Takashima, Y. Kanaya, K. F. Boersma, L. Gast, F. Wittrock, D. Brunner, Y. Zhou, M. Roozendael |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 6 ; Nr. 4, no. 6 (2011-06-09), S.1027-1044 |
| Datensatznummer |
250002006
|
| Publikation (Nr.) |
 copernicus.org/amt-4-1027-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| We attempt for the first time to retrieve lower-tropospheric vertical
profile information for 8 quantities from ground-based Multi-Axis
Differential Optical Absorption Spectroscopy (MAX-DOAS) observations. The
components retrieved are the aerosol extinction coefficients at two
wavelengths, 357 and 476 nm, and NO2, HCHO, CHOCHO, H2O, SO2,
and O3 volume mixing ratios. A Japanese MAX-DOAS profile retrieval
algorithm, version 1 (JM1), is applied to observations performed at Cabauw,
the Netherlands (51.97° N, 4.93° E), in June–July 2009 during the
Cabauw Intercomparison campaign of Nitrogen Dioxide measuring Instruments
(CINDI). Of the retrieved profiles, we focus here on the lowest-layer data
(mean values at altitudes 0–1 km), where the sensitivity is usually highest
owing to the longest light path. In support of the capability of the
multi-component retrievals, we find reasonable overall agreement with
independent data sets, including a regional chemical transport model
(CHIMERE) and in situ observations performed near the surface (2–3 m) and at
the 200-m height level of the tall tower in Cabauw. Plumes of enhanced HCHO
and SO2 were likely affected by biogenic and ship emissions,
respectively, and an improvement in their emission strengths is suggested
for better agreement between CHIMERE simulations and MAX-DOAS observations.
Analysis of air mass factors indicates that the horizontal spatial
representativeness of MAX-DOAS observations is about 3–15 km (depending
mainly on aerosol extinction), comparable to or better than the spatial
resolution of current UV-visible satellite observations and model
calculations. These demonstrate that MAX-DOAS provides multi-component data
useful for the evaluation of satellite observations and model calculations
and can play an important role in bridging different data sets having
different spatial resolutions. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|