Table 1. General information about the sets of samples used, their source, classification and main characteristics of interest for the meta-analysis.

Author/ Year	N° of samples used	Matrix	Classification	Range of depth (m)
Cooper et al. (2019)	17	Ice-water- sediment	Both	6.13–55
Fernández-Gómez et al. (2019)	11	Ice-water	Subsurface	0.85–1.6
Menéndez-Serra et al. (2021)	33	Water	Subsurface	0.1–0.4
Kalwasińska et al. (2018)	1	Water	Deep	405
Lach et al. (2023)	6	Water	Subsurface	125
Baricz et al. (2021)	34	Water	Subsurface	0.5–9
Andrei et al., 2015	8	Water	Subsurface	0.5–11
Akpolat et al. (2021)	4	Water	Both	1
Sisma-Ventura et al. (2022)	45	Water	Both	1–1045
Abdallah et al. (2014)	-	Water	Deep	1468–2030
Lee et al. (2014)	2	Water	Deep	845
Sierra et al. (2022)	9	Sediment-water	Both	0.35–0.75
Saxton et al. (2021)	3	Sediment-water	Deep	75.2–68