FIGURE LEGENDS
Fig. 1 Typhoon migration route and the location of sampling
station. The arrows roughly indicate the directions for the moisture
transport. The purple arrow represents the continental moisture. The
blue arrows represent the ocean-originated moisture including Pacific
Ocean, Indian Ocean, and South China Sea.
Fig. 2 The variation of meteorological parameters,
precipitation isotopes (δD and
δ18O), and D-excess during the study period from June
2018 to August 2019. The data of meteorological parameters were obtained
from China Meteorological Data Service Centre (http://data.cma.cn). The
red box indicates the impact of typhoon processes on the study area, and
the typhoon name is labeled in the figure. The dashed line of δD,
δ18O, and D-excess represent monthly average value,
which was calculated by a weighted average of precipitation amount,
using the equation\(\delta=\sum_{i=1}^{n}{P_{i}\delta_{i}/\sum_{i=1}^{n}P_{i}}\),
where \(P_{i}\) and \(\delta_{i}\) denote daily precipitation amount and
its δ value.
Fig. 3 Typical time-series of different isotopic composition of
precipitation with temperature and relative humidity in the normal
condition.
Fig. 4 Time-series of isotopic composition of precipitation
with temperature and relative humidity under the impact of (a) TD, (b)
Typhoon Yutu, and (c) Typhoon Bailu.
Fig. 5 Local meteoric water line (MWLs) for the Xiamen, based
on the data of (a) all individual samples, (b) typhoon-related
precipitation samples, (c)
summer
monsoon samples from May to September, (d) winter monsoon samples from
October to February, (e) seasonal shift period samples from March to
April. The filled circles present typhoon precipitation samples, and the
hollow circles present precipitation samples collected in normal
condition. The red full line indicates global meteoric water line (GMWL,
δD
=
8δ18O
+ 10), and the black full line indicates China meteoric water line
(CMWL, δD =
7.9δ18O
+ 8.2).
Fig. 6 The correlation (a) between δ18O and
temperature, and (b) between δ18O and precipitation
amount.
Fig. 7 Back trajectories (72 hours) of moisture sources
calculated by HYSPLIT at 500 (red lines), 1000 (blue lines) and 2000 m
(green lines) over Xiamen before the different typical precipitation.
Fig. 8 The correlation between δD and δ18O
for different stages of typhoon-related precipitation.
Fig. 9 Back trajectories (72 hours) of moisture sources
calculated by HYSPLIT at 500 (red lines), 1000 (blue lines) and 2000 m
(green lines) over Xiamen before the precipitation during (a) Typhoon
Maria, (b) TD, (c) Typhoon Yutu, and (d) Typhoon Bailu. The black dotted
lines represent the migrate route of the typhoons.