Survey, 2023-01-01, Kyrgyzstan

Issyk-Kul, oligotrophic lake cal/val

High-resolution LIF LiDAR transects across the oligotrophic, high-altitude Issyk-Kul lake, over 4,000 chlorophyll-a and 1,000 suspended-sediment measurements used to build regional Sentinel-2/MSI retrieval models. Reported in Remote Sensing, 2023.

Published figures

Interpolated fields from the campaign, reproduced as issued. Plate titles carry the LIFL-9 under its original designation, UFL-9.

Whole-lake composite

Interpolated chlorophyll a field mapped along the lidar track, Lake Issyk-Kul, Whole-lake composite
Fig. 1Chlorophyll a
Interpolated total organic carbon field mapped along the lidar track, Lake Issyk-Kul, Whole-lake composite
Fig. 2Total organic carbon
Interpolated total suspended matter field mapped along the lidar track, Lake Issyk-Kul, Whole-lake composite
Fig. 3Total suspended matter

2016 campaign

Interpolated chlorophyll a field mapped along the lidar track, Lake Issyk-Kul, 2016 campaign
Fig. 4Chlorophyll a
Interpolated total organic carbon field mapped along the lidar track, Lake Issyk-Kul, 2016 campaign
Fig. 5Total organic carbon
Interpolated total suspended matter field mapped along the lidar track, Lake Issyk-Kul, 2016 campaign
Fig. 6Total suspended matter

Eastern basin, July 2022

Interpolated chlorophyll a field mapped along the lidar track, Lake Issyk-Kul, Eastern basin, July 2022
Fig. 7Chlorophyll a
Interpolated CDOM field mapped along the lidar track, Lake Issyk-Kul, Eastern basin, July 2022
Fig. 8CDOM
Interpolated total suspended matter field mapped along the lidar track, Lake Issyk-Kul, Eastern basin, July 2022
Fig. 9TSM

Northern shore, July 2022

Interpolated chlorophyll a field mapped along the lidar track, Lake Issyk-Kul, Northern shore, July 2022
Fig. 10Chlorophyll a
Interpolated CDOM field mapped along the lidar track, Lake Issyk-Kul, Northern shore, July 2022
Fig. 11CDOM
Interpolated total suspended matter field mapped along the lidar track, Lake Issyk-Kul, Northern shore, July 2022
Fig. 12TSM
Lake Issyk-KulCentral Asia
10 km
● Lake Issyk-Kul 2016, 2016-10-31 → 2016-11-03181,188 measurements IDW interpolation, 600 samples
Chl-a0.030.17µg/L
CDOM2.197.11a.u.
TSS0.320.84mg/L

Fig. 13 Campaign scan. 181,188 lidar returns along the ship track, switchable across Chl-a, CDOM, TSS. Field view interpolates the channel across the surveyed water from the same measurements (inverse-distance weighting). Shoreline: Natural Earth.

Issyk-Kul is a large, deep, oligotrophic lake high in the Kyrgyz mountains, clear water with low, spatially subtle variation in its optical constituents, which makes it a demanding cal/val site. In a single one-day survey, LIF LiDAR transects produced more than 4,000 chlorophyll a and 1,000 suspended-sediment match-ups in the upper water layer.

This ground-truth dataset, collected to coincide with a satellite overpass, was used to build preliminary regional bio-optical models and test them against Sentinel-2A imagery, extending the dense-match-up method from eutrophic coastal and inland waters to a clear, oligotrophic lake. Published in Remote Sensing (2023).