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Mexican activities with regard to TEMPO
Michel Grutter, Josue Arellano, Alejandro Bezanilla, Martina Friedrich, Arne Kruger, Claudia Rivera and Wolfgang Stremme
Centro de Ciencias de la Atmósfera – UNAMUniversidad Nacional Autónoma de Méxicowww.atmosfera.unam.mx/espectroscopia
3rd Tempo Science Team MeetingMay 27-28, 2015
Huntsville, Alabama
Activities
• INECC-SEMARNAT (Ministry of the Environment): • Memorandum of Understanding• CONACYT project grant 2015-2016: “Temporal and Spatial
Variability of CO2 and CH4 in Mexico”
• AEM-SCT (Mexican Space Agency)• Call for proposals for the “...use of space technology to assess
polllution and environmental risks”
• UNAM (my group):• Validation efforts of NO2 and HCHO from OMI (ongoing)• Participation in TROPOMI (S5P Validation Team)• Comparison with an air quality model
High Altitude site Altzomoni
Solar absorption FTIR (HR120/5)
MAX-DOAS (NO2, SO2, HCHO, ...)
DS-DOAS, 2D-DOAS
Thermal emission FTIR (2D)
Ceilometer (commercial LIDAR)
GPS (precipitable water column)
Meteorology (WS, WD, T, P, RH, Rain)
Reactive Gases (O3, CO, NOx, SO2)
GHG (CO2, CH4, H2O)
PM, Black Carbon
Wet/Dry deposition (Chem/Isotope)
Remote Sensing
In Situ
3,985 m a.s.l.
2 FTIR sites in central Mexico
Urban site at UNAM2,280 m a.s.l.
O3, CO, CH4, CO2, N2O, ...
NDACC certified station
MAX DOAS network Mexico City
10 km
45 km
west east
MAX DOAS network Mexico City
10 km
45 km
west east
MAX DOAS network Mexico City
10 km
45 km
west east
MAX DOAS network Mexico City
10 km
45 km
22
22
22222 2
2 2
22
2
22
2
(2 x 2 x 9) angles + zenith1 scan ~ 5 min
MAX DOAS network Mexico City – OMI NO2
10 km
45 km
2.0
1.0
0.5
0
1.5
~ 14:20
(2 x 2 x 9) angles + zenith1 scan ~ 5 min horizontal homogenity?
Claudia I. Rivera C. et al 2013 Avg-NO2 distribution OMI satellite
OMI NO2 map
MAX DOAS network Mexico City – OMI NO2
10 km
45 km
2.0
1.0
0.5
0
1.5
~ 14:20
(2 x 2 x 9) angles + zenith1 scan ~ 5 min
resolved structure
λ/ nm
σ / c
m2
horizontal homogenity?
Claudia I. Rivera C. et al 2013 Avg-NO2 distribution OMI satellite
OMI NO2 map
From measured spectra to profiles
wavelength
inte
nsity
spectra dSCD profiles/ VCD
MMF retrieval algorithm
O4dSCD Radiative Transfer Model
VLIDORT
DOAS TechniqueQDOAS Aerosol density profile
sim. O4 jacobians
Target gas profiles
Const. Least sq. fitting
Radiative Transfer ModelVLIDORT
P, T-profilesradiosounde
measurements
sim. target gas dSCD A priori trace gas profile
WRF-chem model
A priori total column aerosol optical depth http://aeronet.gsfc.nasa.gov/
iteration
iteration
A priori aerosol profile shapeaveraged ceilometer measurements
Const. Least sq. fitting
O4 profile
A priori aerosol profile average aerosol ω and βhttp://aeronet.gsfc.nasa.gov/
O4error e
trace gas σ
sim. O4 dSCD
sim. target gas jacobians
converged
O4 σ
converged
Target gaserror e
Target gasdSCD
a - priori information
aerosols trace gas: NO2, HCHOav. WRF-chem model data Wolfgangaveraged ceilometer data
aerosol optical depth τ single scattering albedo ω
asymmetry parameter g → β
AERONET
covariance matrix
hei
gh
t /m
aerosol load
Single scan Tuesday, Jan 14th 2014
MORNING 10:15
Single scan Tuesday, Jan 14th 2014
MORNING 10:15
Single scan Tuesday, Jan 14th 2014
MORNING 10:15
Single scan Tuesday, Jan 14th 2014
MID DAY 12:30
Single scan Tuesday, Jan 14th 2014
MID DAY 12:30
Single scan Tuesday, Jan 14th 2014
OMI OVERPASS 14:20
Single scan Tuesday, Jan 14th 2014
OMI OVERPASS 14:20
Single scan Tuesday, Jan 14th 2014
LATE AFTERNOON 16:40
Single scan Tuesday, Jan 14th 2014
LATE AFTERNOON 16:40
Jan 14th 2014 : VCD (E – W) , surface VMR
Timeseries
local time local time
VCD
/ c
m2
DOF
fitting error
Jan 14th 2014 : VCD (E – W) , surface VMR
Timeseries
local time local time
VCD
/ c
m2
DOF
fitting error
Jan 14th 2014: height profile over time
Timeseries
VCD
/ c
m2
DOF
fitting error
NO2 comparison: OMI vs. WRF
4 regions
Mexico City
Puebla
Cueravaca
Toluca
OMI WRF - simulation
1-year average: 2014
NO2 comparison: OMI vs. WRF
• OMI columns are not yet validated with ground measurements
• Mex. City is better characterized by the model
4-year trend for NO2?
There is a tendency to observe lower NO2 columns
Analyzing more years will give a better evaluation
Other regions/cities in Mexico
Conclusions / future work
• dSCD of O4, NO2 and HCHO from the MAX-DOAS network are now being measured in four locations within Mexico City
• The MMF retrieval algorithm for profile / total column MAX-DOAS data is working
• An operative product of VCD and profiles of these gases will soon be available
• Validation of satellite data is in progress
• Collaborations are welcome
Thank you !
Michel Grutter, Josue Arellano, Alejandro Bezanilla, Martina Friedrich, Arne Kruger, Claudia Rivera and Wolfgang Stremme
Centro de Ciencias de la Atmósfera – UNAMUniversidad Nacional Autónoma de Méxicowww.atmosfera.unam.mx/espectroscopia
3rd Tempo Science Team MeetingMay 27-28, 2015
Huntsville, Alabama
