Implications for cosmology from Ground-based Cosmic Microwave Background
  observations
  Cosmic Microwave Background (CMB) anisotropy encodes a lot of information
about our Universe. In this paper we take the ground-based CMB observations
(GCMB), including the South Pole Telescope (SPT), SPTpol and the Atacama
Cosmology Telescope Polarimeter (ACTPol), as a new probe to the CMB anisotropy
independent of two satellite observations, i.e. Wilkinson Microwave Anisotropy
Probe (WMAP) and Planck. The combination of current GCMB data is consistent
with WMAP and Planck. In the spatially flat $\Lambda$CDM model, the Hubble
constant is $H_0=69.72\pm 1.63$ km/s/Mpc at $68\%$ confidence level (CL).
Combining with baryon acoustic oscillation (BAO) and the Pantheon sample of
Type Ia supernovae (SN), we find that $H_0=68.40\pm 0.58$ km/s/Mpc ($68\%$ CL)
in the spatially flat $\Lambda$CDM cosmology which has a tension with local
measurement given by Riess et al. in 2019 at $3.7\sigma$ level, and
$\Omega_k=-0.0013\pm 0.0039$ and $N_{\rm{eff}}=2.90\pm 0.41$ ($68\%$ CL) in the
extended cosmological models.
