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Subject: =?UTF-8?Q?Re=3A_Les_mod=C3=A8les_climatiques_calculent_des_temp=C3=A9rat?=
	=?UTF-8?Q?ures_biais=C3=A9es_vers_le_haut?=
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Le vendredi 30 juin 2023 =C3=A0 23:06:24 UTC+2, PaulAubrin a =C3=A9crit=C2=
=A0:
> "L'AR5 a =C3=A9valu=C3=A9 avec un faible degr=C3=A9 de confiance que la p=
lupart des=20
> mod=C3=A8les CMIP3 et CMIP5, mais pas tous, ont surestim=C3=A9 la tendanc=
e au=20
> r=C3=A9chauffement observ=C3=A9e dans la troposph=C3=A8re tropicale au co=
urs de la=20
> p=C3=A9riode 1979-2012, et qu'un tiers =C3=A0 la moiti=C3=A9 de cette dif=
f=C3=A9rence =C3=A9tait=20
> due =C3=A0 une surestimation de la tendance de la TSM [temp=C3=A9rature d=
e surface=20
> de la mer] au cours de cette p=C3=A9riode. Depuis l'AR5, des =C3=A9tudes=
=20
> suppl=C3=A9mentaires bas=C3=A9es sur les mod=C3=A8les CMIP5 et CMIP6 mont=
rent que ce=20
> biais de r=C3=A9chauffement des temp=C3=A9ratures troposph=C3=A9riques pe=
rsiste.=20
>=20
> GIEC - AR6 page 443=20
>=20
> "Plusieurs =C3=A9tudes utilisant les mod=C3=A8les CMIP6 sugg=C3=A8rent qu=
e les=20
> diff=C3=A9rences de sensibilit=C3=A9 climatique peuvent =C3=AAtre un fact=
eur important=20
> contribuant =C3=A0 la divergence entre les tendances simul=C3=A9es et obs=
erv=C3=A9es de=20
> la temp=C3=A9rature troposph=C3=A9rique (McKitrick et Christy, 2020 ; Po-=
Chedley=20
> et al., 2021)"=20
>=20
> GIEC - AR6 page 443

Oui et alors ?

Quelles conclusions bien orient=C3=A9es en tirez-vous ?