Comparisons of the Orbiting Carbon Observatory-2 (OCO-2) XCO2 measurements with TCCON
Debra Wunch1,12,Paul O. Wennberg1,Gregory Osterman2,1,Brendan Fisher2,1,Bret Naylor2,1,Coleen M. Roehl1,Christopher O'Dell3,Lukas Mandrake2,1,Camille Viatte1,Matthäus Kiel1,10,David W. T. Griffith4,Nicholas M. Deutscher4,5,Voltaire A. Velazco4,Justus Notholt5,Thorsten Warneke5,Christof Petri5,Martine De Maziere6,Mahesh K. Sha6,Ralf Sussmann7,Markus Rettinger7,David Pollard8,John Robinson8,Isamu Morino9,Osamu Uchino9,Frank Hase10,Thomas Blumenstock10,Dietrich G. Feist11,Sabrina G. Arnold11,Kimberly Strong12,Joseph Mendonca12,Rigel Kivi13,Pauli Heikkinen13,Laura Iraci14,James Podolske14,Patrick W. Hillyard14,19,Shuji Kawakami15,Manvendra K. Dubey16,Harrison A. Parker16,Eliezer Sepulveda17,Omaira E. García17,Yao Te18,Pascal Jeseck18,Michael R. Gunson2,1,David Crisp2,1,and Annmarie Eldering2,1Debra Wunch et al.Debra Wunch1,12,Paul O. Wennberg1,Gregory Osterman2,1,Brendan Fisher2,1,Bret Naylor2,1,Coleen M. Roehl1,Christopher O'Dell3,Lukas Mandrake2,1,Camille Viatte1,Matthäus Kiel1,10,David W. T. Griffith4,Nicholas M. Deutscher4,5,Voltaire A. Velazco4,Justus Notholt5,Thorsten Warneke5,Christof Petri5,Martine De Maziere6,Mahesh K. Sha6,Ralf Sussmann7,Markus Rettinger7,David Pollard8,John Robinson8,Isamu Morino9,Osamu Uchino9,Frank Hase10,Thomas Blumenstock10,Dietrich G. Feist11,Sabrina G. Arnold11,Kimberly Strong12,Joseph Mendonca12,Rigel Kivi13,Pauli Heikkinen13,Laura Iraci14,James Podolske14,Patrick W. Hillyard14,19,Shuji Kawakami15,Manvendra K. Dubey16,Harrison A. Parker16,Eliezer Sepulveda17,Omaira E. García17,Yao Te18,Pascal Jeseck18,Michael R. Gunson2,1,David Crisp2,1,and Annmarie Eldering2,1
Abstract. NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry-air mole fraction, XCO2, in the Earth's atmosphere for over 2 years. In this paper, we describe the comparisons between the first major release of the OCO-2 retrieval algorithm (B7r) and XCO2 from OCO-2's primary ground-based validation network: the Total Carbon Column Observing Network (TCCON). The OCO-2 XCO2 retrievals, after filtering and bias correction, agree well when aggregated around and coincident with TCCON data in nadir, glint, and target observation modes, with absolute median differences less than 0.4 ppm and RMS differences less than 1.5 ppm. After bias correction, residual biases remain. These biases appear to depend on latitude, surface properties, and scattering by aerosols. It is thus crucial to continue measurement comparisons with TCCON to monitor and evaluate the OCO-2 XCO2 data quality throughout its mission.
This paper describes the comparisons between NASA's Orbiting Carbon Observatory (OCO-2) column-averaged dry-air mole fractions of CO2 with its primary ground-based validation network, the Total Carbon Column Observing Network (TCCON). The paper shows that while the standard bias correction reduces much of the spurious variability in the satellite measurements, residual biases remain.
This paper describes the comparisons between NASA's Orbiting Carbon Observatory (OCO-2)...