The package now presents data for only the 28 original AEAP+ALTM
lakes, matching the scope of Farrell et al. 2018. The figshare archive
(doi:10.6084/m9.figshare.32305479) still contains records for 25
additional ALTM-only lakes; those rows are filtered out by
adk_data() for consistency with the published dataset. No
changes to the archive itself.
adklakedata 0.7.0
Data updates
Water chemistry through October 2024. Records
2013-present sourced from the USGS AQ Samples database
(https://waterdata.usgs.gov/download-samples/). The Adirondack Long-Term
Monitoring (ALTM) program continues to be processed by the ALSC
laboratory; the data pipeline now goes through USGS rather than the
original ALSC archive. Mapping validated against 2012 overlap with the
published dataset (correlation >= 0.989 for all 20 analytes, mean
difference < 1.6%).
25 additional ALTM-only lakes added: Arbutus,
Avalanche, Barnes, Black (Paul Smiths), Bubb, Clear (N Hudson), East
Copperas, Grass (St Regis), Heart, Hope, Lake Colden, Little Clear,
Little Echo, Little Hope, Little Simon, Lost, Marcy, Middle (Floodwood),
Muskrat, Nate, Otter, Otter (unnamed), Owen, Sochia, Sunday. These lakes
have chem and nutrient records 1992-2024 but no biological, Secchi, or
profile data.
Nutrients table extended with USGS-ALTM records
1992-2024. The values in nutrients.csv now come from two different
sampling protocols; use the new program column to
filter.
DOI for the new data archive:
https://doi.org/10.6084/m9.figshare.32305479
Schema changes
waterchem.csv: new column surface.temp.C
(water temperature at time of sample, °C; available for ~10% of rows,
all post-2006).
nutrients.csv: new columns UV254.AU.cm (UV
absorbance at 254 nm, AU/cm; ALTM only) and program
(AEAP or ALTM).
lake_characteristics.csv: new column
data.availability (AEAP+ALTM for the original
28 lakes with full coverage; ALTM for the 25 lakes added in
v0.7.0 with chem and nutrients only).
The 25 new lakes have lat/lon in lake_characteristics.csv but other
morphology fields are NA.
AEAP-era rows in nutrients.csv have UV254.AU.cm = NA
and program = "AEAP".
Not updated in v0.7.0
The following tables still cover only the original 28 lakes through
2012:
temp_do_profiles.csv (AEAP profiles)
secchi.csv
phyto.csv, rotifer.csv,
crustacean.csv
nldas_drivers_1979_2016.csv (meteorology, NLDAS-2
through 2016)
Methods notes
Nitrate is reported as NO3- (matching the original published
dataset), filtered from the USGS as N parallel
records.
Ammonia is reported as NH4+, filtered from the USGS
as N parallel records.
pH uses the ALSC air-equilibrated method (USGS analytical method id
EL021), reproducing the values in the original published dataset to
within rounding error. The ALSC Ross-electrode pH (EL019) typically
reads ~0.13 units lower and is not used.
Citation
If you use this data, please cite both the original paper and the
v0.7.0 archive:
Farrell, J. M., Winslow, L. A., Leach, T. H., Hahn, T., & Rose,
K. C. (2018). Long-term dataset on aquatic responses to concurrent
climate change and recovery from acidification. Scientific
Data, 5, 180059. https://doi.org/10.1038/sdata.2018.59
Farrell, J. (2025). Adirondack Long-Term Lake Data - chemistry
update through 2024 (v0.7.0). figshare.
https://doi.org/10.6084/m9.figshare.32305479