Fig 7 -

• Main Authors: Yuan Yue (313562), HaiFeng Liu (11725991), XiuXiang Mu (11725994), MengSheng Qin (11725997), TingTing Wang (10276238), Qi Wang (22418), YaQiong Yan (11726000)
• Format: Still Image
• Language: unknown
• Published: 2021
• Subjects: Cell Biology; Molecular Biology; Ecology; Developmental Biology; Inorganic Chemistry; Environmental Sciences not elsewhere classified; Biological Sciences not elsewhere classified; statistically significant influence; sen &# 8217; results show mitigations; respectively identified using; provide valuable reference; potential evapotranspiration data; polar &# 8211; cross wavelet transform; continuous wavelet transform; significant increasing trend; three defined regions; atlantic multidecadal oscillation; scale climate patterns; regional drought mitigation; cwt analysis showed; month time scales; month period ); month period; trend test; decadal scales; climate indices; western regions; southern oscillation; different regions; arctic oscillation; month cycles; year cycles; xlink ">; temporal characteristics; slope method; significantly correlated; possible relationship; periodic features; northeast china; eurasian pattern; eurasia pattern; drought conditions; autumn drought; around 120; annual scale; 140 stations; Arctic
• Online Access: https://doi.org/10.1371/journal.pone.0259774.g007

(a) Cross wavelet power spectrum (XWT) and (b) wavelet coherence (WTC) between SPEI-12 time series for region R2 and climate indices. The thick black contours depict the 5% significance level of local power relative to red noise; the cone of influence (COI) is shown as a lighter shade. Right-pointing arrows indicate that the two signals are in phase while left-pointing arrows show anti-phase signals.