When were OCO-2 and OCO-3 launched into space?*5 pointsOCO-2 was launched in 2014 and OCO-3 in 2020.OCO-2 was launched in 2012 and OCO-3 in 2020.OCO-2 was launched in 2020 and OCO-3 in 2013.OCO-2 was launched in 2014 and OCO-3 in 2019.

15. OCO-2 and OCO-3 data are freely available and can be accessed through the NASA GES DISC data archive center.*5 pointsTrueFalse

3. OCO-2 has the following characteristics:*5 pointsIts temporal repeat is every 12 days and observations are made at ~8:30 a.m. local time.Its temporal repeat is every 10 days and observations are made at ~10:30 a.m. local time.Its temporal repeat is every 16 days and observations are made at ~1:30 p.m. local time.Its temporal repeat is every 16 days and observations are made at ~5:30 p.m. local time.

16. The estimated accuracy of XCO2 from OCO-2 and OCO-3 when compared to the TCCON network is the following:*5 pointsLess than 45 ppmv for OCO-2 (v. 11.1) and less than 50 ppmv for OCO-3 (v. 10.4)Less than 20 ppmv for OCO-2 (v. 11.1) and less than 25 ppmv for OCO-3 (v. 10.4)Less than 5 ppmv for OCO-2 (v. 11.1) and less than 7 ppmv for OCO-3 (v. 10.4)Less than 0.8 ppmv for OCO-2 (v. 11.1) and less than 1 ppmv for OCO-3 (v. 10.4)

9. The XCO2 measurement from OCO-2/OCO-3 is directly comparable to an in situ measurement at a surface site or a single point in the atmosphere.*5 pointsTrueFalse

10. XCO2 measurements from OCO-2 and OCO-3 can be combined together in an analysis.*5 pointsTrueFalse