Auxiliary Material for Paper 2012GL052738

Space-based observations of megacity carbon dioxide

Eric A. Kort 
W. M. Keck Institute for Space Studies, California Institute of Technology, 
Pasadena, California, USA

Jet Propulsion Laboratory, California Institute of Technology, 
Pasadena, California, USA

Christian Frankenberg and Charles E. Miller 
Jet Propulsion Laboratory, California Institute of Technology, 
Pasadena, California, USA

Tom Oda
Cooperative Institute for Research in the Atmosphere, Colorado State University, 
Fort Collins, Colorado, USA

Earth System Research Laboratory, NOAA, 
Boulder, Colorado, USA


Kort, E. A., C. Frankenberg, C. E. Miller, and T. Oda (2012), Space-based 
observations of megacity carbon dioxide, Geophys. Res. Lett., 39, L17806, 
doi:10.1029/2012GL052738.

Introduction

Auxiliary materials for this paper contains a text file and six figures.

1. 2012gl052738-txts01.pdf
Text S1. Details on other cities investigated, specifics of uncertainty 
calculations, and assessment of potential retrieval errors on the 
analysis.

2. 2012gl052738-fs01.pdf
Figure S1. Time-series for Los Angeles basin and desert observations. 
Averaged in 20 (a) and 30 (b) day bins, defined as in Fig. 1. Difference 
between 20 (c) and 30 (d) day averaged basin and desert values. The solid 
black line shows the average di+ACI-erence (3.3  1.1 ppm for 20-day bins, 
3.1  1.2 ppm for 30-day bins). All error-bars plotted are one-sigma.

3. 2012gl052738-fs02.pdf
Figure S2. Number of observations for each averaging bin. Displayed for 
the basin (top row) and desert (bottom row) bin for 10 (a), 20 (b), and 
30 (c) day block averages.

4. 2012gl052738-fs03.pdf
Figure S3. Distribution of Los Angeles basin-desert difference.  a) 
Histogram of basin-desert di+ACE-erence for the GOSAT XCO2 observations in 
Los Angeles. The red line represents a Gaussian distribution. b) 
Quantile-quantile plot of 10-day average basin-desert differences in LA. 
The solid line represents a Gaussian distribution.

5. 2012gl052738-fs04.pdf
Figure S4. Observed XCO2 urban dome of Mumbai. a) Nightlights map of 
Mumbai megacity and surroundings. Selected GOSAT observations over the 
city (pink circles) and nearby rural areas (red triangles). b) Time-
series for city and rural observations averaged in 10-day bins. c) The 
di+ACE-erence between 10-day block averages ob city and rural observations. 
The solid black line shows the average difference (2.4  1.2 ppm).

6. 2012gl052738-fs05.pdf
Figure S5. Assessment of potential systematic biases on retrievals. a) 
Basin-desert dP (retrieved - a priori surface pressure, Pa) vs. basin-
desert XCO2 enhancement. b) Basin-desert signal+AF8-o2 (A-band spectral 
radiance, W cm-2 sr-1 (cm-1)-1 +ACo- 107) vs. basin-desert XCO2 enhancement. 
c) Basin-desert aod (aerosol optical depth) vs. basin-desert XCO2 
enhancement. d) Basin-desert blended+AF8-albedo vs. basin-desert XCO2 
enhancement.  The lack of correlation indicates none of these parameters 
are responsible for the observed basin enhancement.

7. 2012gl052738-fs06.pdf
Figure S6. Windrose depicting most frequent wind direction is on-shore 
(westerly), with occasional reversals (from LAX, 2009-present).


http://dx.doi.org/10.1029/2012GL052738