Diffuse Attenuation Coefficient of Downwelling Irradiance (K_d)

AOP | PACE Data Matchups

Here, we validate the spectral Diffuse Attenuation Coefficient of Downwelling Irradiance (K_d, units: m^-1), which describes how sunlight of different wavelengths (colors) is dissipated as it travels downward into the ocean. For PACE-OCI, K_d is modelled as a function of derived inherent optical properties (IOPs; absorption and backscattering coefficients). These IOPs are first derived from PACE-OCI K_d (see algorithm description).

Diffuse Attenuation Coefficient of Downwelling Irradiance (K_d) Click to download data: Select K_d matchup statistics \| Select K_d matchups
Wavelength	Mean Bias	Limits of Agreement		Linear Slope	Linear Intercept	Linear Correlation	Rank Correlation	uRMSE [View plot]	MedAE [View plot]	Matchup Plots
Wavelength	Mean Bias	Low	High	Linear Slope	Linear Intercept	Linear Correlation	Rank Correlation	uRMSE [View plot]	MedAE [View plot]	Matchup Plots
Kd_400	0.31	-1.83	2.45	23.4	-2.32	0.739	0.951	0.734	0.014	Click here
Kd_412	0.295	-999	-999	16.4	-1.55	0.718	0.938	0.449	0.0274	Click here
Kd_443	0.206	-999	-999	14.4	-1.15	0.724	0.946	0.314	0.023	Click here
Kd_490	0.0344	-0.152	0.221	3.21	-0.137	0.861	0.964	0.0834	0.0167	Click here
Kd_510	0.0247	-0.115	0.165	2.87	-0.132	0.865	0.965	0.0737	0.0144	Click here
Kd_560	0.014	-0.0718	0.0999	2.64	-0.152	0.822	0.89	0.0583	0.0123	Click here
Kd_620	0.211	-0.574	0.997	56.3	-17.9	0.133	0.255	0.289	0.0942	Click here
Kd_665	0.677	-999	-999	40.1	-17.5	0.393	0.483	1.26	0.183	Click here

Disclaimer: The unbiased RMESs and Median Absolute Errors shown in the hyperspectral plots are preliminary. Visitors should expect updated values over time due to incoming datasets with different spatial and temporal variability coverages and dynamic ranges, as well as to algorithm refinements.