Research Note

Climate Physics & Atmospheric Science

Zhenyu He · Jobs Stroustrup 2 min read

Expert (academic research level)

Convection dynamics: plume models (MTT), LES, tropopause constraints
Atmospheric radiation: radiative heating rates, radiative balance analysis
Large-scale circulation: Walker circulation, Hadley circulation, responses to global warming
Nuclear winter hypothesis: stratospheric soot injection mechanisms, soot lifetime and radiative effects
Aerosol physics: extinction coefficients, AOD, retrieval algorithms
Methane remote sensing: TROPOMI data processing, emission source attribution

— nuclear winter, Hiroshima plume, convection dynamics
— methane anomaly mapping
Undergraduate Research @ Peking University & Caltech/UCR — Walker/Hadley circulation, aerosol retrieval
Invited Speaker @ Princeton School on Science and Global Security — nuclear security presentation
Walker Circulation Dynamics @ PKU — Linear Superposition + Walker/width
Walker/Hadley Circulation Response Under Global Warming @ PKU — earliest multi-method comparison spine
Aerosol Joint Retrieval Senior Thesis @ PKU — MODIS+CALIPSO joint retrieval
DSCOVR Inverse Problem + Regularization Methods @ Caltech / UCR — atmospheric inverse problem (DSCOVR Earth retrieval)
— DSE+SWTG methodology workshop

Linear Superposition framework (Zhenyu’s original, 2021) — 2nd-order Taylor expansion framework for the Walker Circulation’s response to oceanic forcing width; 4-field validation SST / Precip / ω / SW correlations 0.83-0.93 (see Linear Superposition Framework)
Nuclear Winter 5-phase physical understanding — 1-D thermo (T,q vs h,q 3.58e-5 J/kg validation) → MTT momentum (Hiroshima L_w≈9.5km LNB≈6.6km vs 15.7km photo) → DAM 3-D LES entrainment (DNS 3-30% match) → 46k core-hours production (CERA20C 534 ton soot) → DSE+SWTG methodology workshop ()
Methane 3-scale analysis — TROPOMI aggregated precision 9.76e-5° ≈ 10.87m + density+quantile regression reformulation + negative-slope→positive-slope diagnosis (Nebraska R²=0.633)
MODIS+CALIPSO joint retrieval algorithm — first iteratively-coupled (PKU senior thesis, 4 Beijing case study abs AOD↓ 0.011-0.032)

Large-scale circulation dynamics: Walker / Hadley / Linear Superposition / QLBS cross-disciplinary transfer
Nuclear-winter physics: soot injection mechanism + lifetime + radiative effects + multi-method validation
Aerosol retrieval: MODIS / CALIPSO / AOD / extinction coefficients
Methane remote sensing: TROPOMI / EPA benchmark / regression diagnostics
Nuclear security: Princeton SGS invited talk (2024)